1NETCDF(3) UNIDATA LIBRARY FUNCTIONS NETCDF(3)
2
6 netcdf - Unidata's Network Common Data Form (netCDF) library interface
7
9 include netcdf.inc
10 Most Systems:
13 f77 ... -lnetcdf -lhdf5_hl -lhdf5 -lz -lm
14 CRAY PVP Systems:
17 f90 -dp -i64 ... -lnetcdf
18 Complete documentation for the netCDF libraries can be found at the
20 netCDF website: http://www.unidata.ucar.edu/software/netcdf/.
21
24 This document describes versions 3 and 4 of Unidata netCDF data-access
25 interface for the FORTRAN programming language.
26 character*80 nf_inq_libvers(void)
28 Returns a string identifying the version of the netCDF library,
30 and when it was built, like: "3.1a of Aug 22 1996 12:57:47 $".
31 The RCS ident(1) command will find a string like "$Id: @(#) netcdf li‐
33 brary version 3.1a of Sep 6 1996 15:56:26 $" in the library. The SCCS
34 what(1) command will find a string like "netcdf library version 3.1a of
35 Aug 23 1996 16:07:40 $".
36
38 All netCDF functions (except nf_inq_libvers() and nf_strerror()) return
39 an integer status.
40 If this returned status value is not equal to NF_NOERR (zero), it indi‐
42 cates that an error occurred. The possible status values are defined in
43 netcdf.inc.
44 character*80 nf_strerror(integer status)
46 Returns a string textual translation of the status value, like
48 "Attribute or variable name contains illegal characters" or "No
49 such file or directory".
50
53 integer function nf_create(character*(*) path, integer cmode, integer
54 ncid)
55 Creates a new netCDF dataset at path, returning a netCDF ID in
57 ncid. The argument cmode may include the bitwise-or of the fol‐
58 lowing flags: NF_NOCLOBBER to protect existing datasets (default
59 silently blows them away), NF_SHARE for synchronous dataset up‐
60 dates for classic format files (default is to buffer accesses),
61 When a netCDF dataset is created, is is opened NF_WRITE. The
63 new netCDF dataset is in define mode. NF_64BIT_OFFSET. to cre‐
64 ate a file in the 64-bit offset format (as opposed to classic
65 format, the default). NF_TRUE to create a netCDF-4/HDF5 file,
66 and NF_CLASSIC_MODEL to guarantee that netCDF-4/HDF5 files main‐
67 tain compatibility with the netCDF classic data model.
68 integer function nf__create(character*(*) path, integer cmode, integer
70 initialsize, integer chunksize, integer ncid)
71 Like nf_create() but has additional performance tuning parame‐
73 ters.
74 The argument initialsize sets the initial size of the file at
76 creation time.
77 See nf__open() below for an explanation of the chunksize parame‐
79 ter.
80 integer function nf_open(character*(*) path, integer mode, integer
82 ncid)
83 (Corresponds to ncopn() in version 2)
85 Opens a existing netCDF dataset at path returning a netCDF ID in
87 ncid. The type of access is described by the mode parameter,
88 which may include the bitwise-or of the following flags:
89 NF_WRITE for read-write access (default read-only), NF_SHARE for
90 synchronous dataset updates (default is to buffer accesses), and
91 NF_LOCK (not yet implemented).
92 As of NetCDF version 4.1, and if TRUE support was enabled when
94 the NetCDF library was built, the path parameter may specify a
95 TRUE URL. In this case, the access mode is forced to be read-on‐
96 ly.
97 integer function nf__open(character*(*) path, integer mode, integer
99 chunksize, integer ncid)
100 Like nf_open() but has an additional performance tuning parame‐
102 ter.
103 The argument referenced by chunksize controls a space versus
105 time tradeoff, memory allocated in the netcdf library versus
106 number of system calls. Because of internal requirements, the
107 value may not be set to exactly the value requested. The actual
108 value chosen is returned by reference. Using the value NF_SIZE‐
109 HINT_DEFAULT causes the library to choose a default. How the
110 system choses the default depends on the system. On many sys‐
111 tems, the "preferred I/O block size" is available from the
112 stat() system call, struct stat member st_blksize. If this is
113 available it is used. Lacking that, twice the system pagesize is
114 used. Lacking a call to discover the system pagesize, we just
115 set default chunksize to 8192.
116 The chunksize is a property of a given open netcdf descriptor
118 ncid, it is not a persistent property of the netcdf dataset.
119 As with nf__open(), the path parameter may specify a TRUE URL,
121 but the tuning parameters are ignored.
122 integer function nf_redef(integer ncid)
124 (Corresponds to ncredf() in version 2)
126 Puts an open netCDF dataset into define mode, so dimensions,
128 variables, and attributes can be added or renamed and attributes
129 can be deleted.
130 integer function nf_enddef(integer ncid)
132 (Corresponds to ncendf() in version 2)
134 Takes an open netCDF dataset out of define mode. The changes
136 made to the netCDF dataset while it was in define mode are
137 checked and committed to disk if no problems occurred. Some da‐
138 ta values may be written as well, see "VARIABLE PREFILLING" be‐
139 low. After a successful call, variable data can be read or
140 written to the dataset.
141 integer function nf__enddef(integer ncid, integer h_minfree, integer
143 v_align, integer v_minfree, integer r_align)
144 Like nf_enddef() but has additional performance tuning parame‐
146 ters.
147 Caution: this function exposes internals of the netcdf version 1
149 file format. It may not be available on future netcdf implemen‐
150 tations.
151 The current netcdf file format has three sections, the "header"
153 section, the data section for fixed size variables, and the data
154 section for variables which have an unlimited dimension (record
155 variables). The header begins at the beginning of the file. The
156 index (offset) of the beginning of the other two sections is
157 contained in the header. Typically, there is no space between
158 the sections. This causes copying overhead to accrue if one
159 wishes to change the size of the sections, as may happen when
160 changing names of things, text attribute values, adding at‐
161 tributes or adding variables. Also, for buffered i/o, there may
162 be advantages to aligning sections in certain ways.
163 The minfree parameters allow one to control costs of future
165 calls to nf_redef(), nf_enddef() by requesting that minfree
166 bytes be available at the end of the section. The h_minfree pa‐
167 rameter sets the pad at the end of the "header" section. The
168 v_minfree parameter sets the pad at the end of the data section
169 for fixed size variables.
170 The align parameters allow one to set the alignment of the be‐
172 ginning of the corresponding sections. The beginning of the sec‐
173 tion is rounded up to an index which is a multiple of the align
174 parameter. The flag value NF_ALIGN_CHUNK tells the library to
175 use the chunksize (see above) as the align parameter. The
176 v_align parameter controls the alignment of the beginning of the
177 data section for fixed size variables. The r_align parameter
178 controls the alignment of the beginning of the data section for
179 variables which have an unlimited dimension (record variables).
180 The file format requires mod 4 alignment, so the align parame‐
182 ters are silently rounded up to multiples of 4. The usual call,
183 nf_enddef(ncid) is equivalent to nf__enddef(ncid, 0, 4, 0, 4).
184 The file format does not contain a "record size" value, this is
186 calculated from the sizes of the record variables. This unfortu‐
187 nate fact prevents us from providing minfree and alignment con‐
188 trol of the "records" in a netcdf file. If you add a variable
189 which has an unlimited dimension, the third section will always
190 be copied with the new variable added.
191 integer function nf_sync(integer ncid)
193 (Corresponds to ncsnc() in version 2)
195 Unless the NF_SHARE bit is set in nf_open() or nf_create(), ac‐
197 cesses to the underlying netCDF dataset are buffered by the li‐
198 brary. This function synchronizes the state of the underlying
199 dataset and the library. This is done automatically by
200 nf_close() and nf_enddef().
201 integer function nf_abort(integer ncid)
203 (Corresponds to ncabor() in version 2)
205 You don't need to call this function. This function is called
207 automatically by nf_close() if the netCDF was in define mode and
208 something goes wrong with the commit. If the netCDF dataset
209 isn't in define mode, then this function is equivalent to
210 nf_close(). If it is called after nf_redef(), but before
211 nf_enddef(), the new definitions are not committed and the
212 dataset is closed. If it is called after nf_create() but before
213 nf_enddef(), the dataset disappears.
214 integer function nf_close(integer ncid)
216 (Corresponds to ncclos() in version 2)
218 Closes an open netCDF dataset. If the dataset is in define
220 mode, nf_enddef() will be called before closing. After a
221 dataset is closed, its ID may be reassigned to another dataset.
222 integer function nf_inq(integer ncid, integer ndims, integer nvars, in‐
224 teger natts, integer unlimdimid)
225 integer function nf_inq_ndims(integer ncid, integer ndims)
227 integer function nf_inq_nvars(integer ncid, integer nvars)
229 integer function nf_inq_natts(integer ncid, integer natts)
231 integer function nf_inq_unlimdim(integer ncid, integer unlimdimid)
233 integer function nf_inq_format(integer ncid, integer formatn)
235 Use these functions to find out what is in a netCDF dataset.
237 Upon successful return, ndims will contain the number of dimen‐
238 sions defined for this netCDF dataset, nvars will contain the
239 number of variables, natts will contain the number of at‐
240 tributes, and unlimdimid will contain the dimension ID of the
241 unlimited dimension if one exists, or 0 otherwise. formatn will
242 contain the version number of the dataset <format>, one of
243 NF_FORMAT_CLASSIC, NF_FORMAT_64BIT, NF_FORMAT_NETCDF4, or
244 NF_FORMAT_NETCDF4_CLASSIC.
245 integer function nf_def_dim(integer ncid, character*(*) name, integer
248 len, integer dimid)
249 (Corresponds to ncddef() in version 2)
251 Adds a new dimension to an open netCDF dataset, which must be in
253 define mode. name is the dimension name. dimid will contain
254 the dimension ID of the newly created dimension.
255
258 Users many define types for a netCDF-4/HDF5 file (unless the NF_CLAS‐
259 SIC_MODEL was used when the file was creates). Users may define com‐
260 pound types, variable length arrays, enumeration types, and opaque
261 types.
262 integer function nf_def_compound(integer ncid, integer size, charac‐
266 ter*(*) name, integer typeidp)
267 Define a compound type.
269 integer function nf_insert_compound(integer ncid, integer , charac‐
271 ter*(*) name, integer offset, integer field_typeid)
272 Insert an element into a compound type. May not be done after
274 type has been used, or after the type has been written by an
275 enddef.
276 integer function nf_insert_array_compound(integer ncid, integer , char‐
278 acter*(*) name, integer offset, integer field_typeid, integer
279 ndims, integer dim_sizes[1m(1))
280 Insert an array into a compound type.
282 integer function nf_inq_type(integer ncid, integer , character*(*)
284 name, integer sizep)
285 Learn about a type.
287 integer function nf_inq_compound(integer ncid, integer , character*(*)
289 name, integer sizep, integer nfieldsp)
290 integer function nf_inq_compound_name(integer ncid, integer , charac‐
292 ter*(*) name)
293 integer function nf_inq_compound_size(integer ncid, integer , integer
295 sizep)
296 integer function nf_inq_compound_nfields(integer ncid, integer , inte‐
298 ger nfieldsp)
299 integer function nf_inq_compound_fieldname(integer ncid, integer , in‐
301 teger fieldid, character*(*) name)
302 integer function nf_inq_compound_fieldindex(integer ncid, integer ,
304 character*(*) name, integer fieldidp)
305 integer function nf_inq_compound_fieldoffset(integer ncid, integer ,
307 integer fieldid, integer offsetp)
308 integer function nf_inq_compound_fieldtype(integer ncid, integer , in‐
310 teger fieldid, integer field_typeid)
311 integer function nf_inq_compound_fieldndims(integer ncid, integer , in‐
313 teger fieldid, integer ndims)
314 integer function nf_inq_compound_fielddim_sizes(integer ncid, integer ,
316 integer fieldid, integer dim_sizes[1m(1))
317 Learn about a compound type.
319 integer function nf_def_vlen(integer ncid, character*(*) name, integer
321 base_typeid, integer xtypep)
322 Create a varaible length array type.
324 integer function nf_inq_vlen(integer ncid, integer , character*(*)
326 name, integer datum_sizep, integer base_nc_typep)
327 Learn about a varaible length array type.
329 integer function nf_free_vlen(nc_vlen_t *vl)
331 Free memory comsumed by reading data of a varaible length array
333 type.
334 integer function nf_put_vlen_element(integer ncid, integer , void *
336 vlen_element, integer len, void * data)
337 Write one VLEN.
339 integer function nf_get_vlen_element(integer ncid, integer , void *
341 vlen_element, integer len, void * data)
342 Read one VLEN.
344 integer function nf_free_string(integer len, char **data)
346 Free memory comsumed by reading data of a string type.
348 integer function nf_inq_user_type(integer ncid, integer , character*(*)
350 name, integer , integer , integer , integer )
351 Learn about a user define type.
353 integer function nf_def_enum(integer ncid, integer base_typeid, charac‐
355 ter*(*) name, integer typeidp)
356 Define an enumeration type.
358 integer function nf_insert_enum(integer ncid, integer base_typeid,
360 character*(*) name, const void *value)
361 Insert a name-value pair into enumeration type.
363 integer function nf_inq_enum_member(integer ncid, integer xtype, inte‐
365 ger idx, character*(*) name, void *value)
366 integer function nf_inq_enum_ident(integer ncid, integer xtype, integer
368 idx, integer*8 value, character*(*) identifier)
369 Learn about a name-value pair into enumeration type.
371 integer function nf_def_opaque(integer ncid, integer size, charac‐
373 ter*(*) name, integer xtypep)
374 Create an opaque type.
376 integer function nf_inq_opaque(integer ncid, integer xtype, charac‐
378 ter*(*) name, integer sizep)
379 Learn about opaque type.
381
385 Users may organize data into hierarchical groups in netCDF-4/HDF5 files
386 (unless NF_CLASSIC_MODEL was used when creating the file).
387 integer function nf_inq_grps(integer ncid, integer numgrps, integer
389 ncids[1m(1))
390 Learn how many groups (and their ncids) are available from the
392 group represented by ncid.
393 integer function nf_inq_grpname(integer ncid, character*(*) name)
395 integer function nf_inq_grpname_full(integer ncid, integer len, charac‐
397 ter*(*) name)
398 integer function nf_inq_grpname_len(integer ncid, integer len)
400 integer function nf_inq_grp_parent(integer ncid, integer ncid)
402 integer function nf_inq_grp_ncid(integer ncid, character*(*) name, in‐
404 teger ncid)
405 integer function nf_inq_full_ncid(integer ncid, character*(*) name, in‐
407 teger ncid)
408 Learn about a group.
410 integer function nf_inq_varids(integer ncid, integer nvars, integer )
412 Get the varids in a group.
414 integer function nf_inq_dimids(integer ncid, integer ndims, integer
416 dimids, integer include_parents)
417 Get the dimids in a group and (potentially) its parents.
419 integer function nf_inq_typeids(integer ncid, integer ntypes, integer
421 typeids[1m(1))
422 Get the typeids of user-defined types in a group.
424 integer function nf_def_grp(integer ncid, character*(*) name, integer
426 ncid)
427 Create a group.
429
431 integer function nf_inq_dimid(integer ncid, character*(*) name, integer
432 dimid)
433 (Corresponds to ncdid() in version 2)
435 Given a dimension name, returns the ID of a netCDF dimension in
437 dimid.
438 integer function nf_inq_dim(integer ncid, integer dimid, character*(*)
440 name, integer len)
441 integer function nf_inq_dimname(integer ncid, integer dimid, charac‐
443 ter*(*) name)
444 integer function nf_inq_dimlen(integer ncid, integer dimid, integer
446 len)
447 Use these functions to find out about a dimension.
449 name should be big enough (NF_MAX_NAME) to hold the dimension
451 name as the name will be copied into your storage. The length
452 return parameter, len will contain the size of the dimension.
453 For the unlimited dimension, the returned length is the current
454 maximum value used for writing into any of the variables which
455 use the dimension.
456 integer function nf_rename_dim(integer ncid, integer dimid, charac‐
458 ter*(*) name)
459 (Corresponds to ncdren() in version 2)
461 Renames an existing dimension in an open netCDF dataset. If the
463 new name is longer than the old name, the netCDF dataset must be
464 in define mode. You cannot rename a dimension to have the same
465 name as another dimension.
466
468 integer function nf_def_var(integer ncid, character*(*) name, integer
469 xtype, integer ndims, integer dimids[1m(1), integer varid)
470 (Corresponds to ncvdef() in version 2)
472 Adds a new variable to a netCDF dataset. The netCDF must be in
474 define mode. varid will be set to the netCDF variable ID.
475 integer function nf_inq_varid(integer ncid, character*(*) name, integer
477 varid)
478 (Corresponds to ncvid() in version 2)
480 Returns the ID of a netCDF variable in varid given its name.
482 integer function nf_inq_var(integer ncid, integer varid, character*(*)
484 name, integer xtype, integer ndims, integer dimids[1m(1), integer
485 natts)
486 integer function nf_inq_varname(integer ncid, integer varid, charac‐
488 ter*(*) name)
489 integer function nf_inq_vartype(integer ncid, integer varid, integer
491 xtype)
492 integer function nf_inq_varndims(integer ncid, integer varid, integer
494 ndims)
495 integer function nf_inq_vardimid(integer ncid, integer varid, integer
497 dimids[1m(1))
498 integer function nf_inq_varnatts(integer ncid, integer varid, integer
500 natts)
501 Returns information about a netCDF variable, given its ID.
503 integer function nf_rename_var(integer ncid, integer varid, charac‐
506 ter*(*) name)
507 (Corresponds to ncvren() in version 2)
509 Changes the name of a netCDF variable. If the new name is
511 longer than the old name, the netCDF must be in define mode.
512 You cannot rename a variable to have the name of any existing
513 variable.
514
517 The following functions may only be used on variables in a
518 netCDF-4/HDF5 data file. These functions must be called after the vari‐
519 able is defined, but before an enddef call.
520 integer function nf_def_var_deflate(integer ncid, integer varid, inte‐
522 ger shuffle, integer deflate, integer deflate_level)
523 Turn on compression and/or shuffle filter. (Shuffle filter is only use‐
525 ful for integer data.)
526 integer function nf_inq_var_deflate(integer ncid, integer varid, inte‐
528 ger shufflep, integer deflatep, integer deflate_levelp)
529 Learn about a variable's deflate settings.
531 integer function nf_def_var_fletcher32(integer ncid, integer varid, in‐
533 teger fletcher32)
534 Turn on checksumming for a variable.
536 integer function nf_inq_var_fletcher32(integer ncid, integer varid, in‐
538 teger fletcher32)
539 Learn about checksumming for a variable.
541 integer function nf_def_var_chunking(integer ncid, integer varid, inte‐
543 ger storage, integer chunksizesp[1m(1))
544 Set chunksizes for a variable.
546 integer function nf_inq_var_chunking(integer ncid, integer varid, inte‐
548 ger storagep, integer chunksizesp[1m(1))
549 Learn about chunksizes for a variable.
551 integer function nf_def_var_fill(integer ncid, integer varid, integer
553 no_fill, integer chunksizesp[1m(1))
554 Set a fill value for a variable.
556 integer function nf_inq_var_fill(integer ncid, integer varid, integer
558 storagep, integer chunksizesp[1m(1))
559 Learn the fill value for a variable.
561 integer function nf_def_var_endian(integer ncid, integer varid, integer
563 endian)
564 Set endianness of variable.
566 integer function nf_inq_var_endian(integer ncid, integer varid, integer
568 endianp)
569 Learn the endianness of a variable.
571
576 integer function nf_put_var_text(integer ncid, integer varid, charac‐
577 ter*(*) out)
578 integer function nf_put_var_int1(integer ncid, integer varid, integer*1
581 out[1m(1))
582 integer function nf_put_var_int2(integer ncid, integer varid, integer*2
584 out[1m(1))
585 integer function nf_put_var_int(integer ncid, integer varid, integer
587 out[1m(1))
588 integer function nf_put_var_real(integer ncid, integer varid, real
591 out[1m(1))
592 integer function nf_put_var_double(integer ncid, integer varid, double‐
594 precision out[1m(1))
595 integer function nf_put_var_ubyte(integer ncid, integer varid, inte‐
597 ger*1 out[1m(1))
598 integer function nf_put_var_ushort(integer ncid, integer varid, inte‐
600 ger*2 out[1m(1))
601 integer function nf_put_var_uint(integer ncid, integer varid, integer*4
603 out[1m(1))
604 integer function nf_put_var_int64(integer ncid, integer varid, inte‐
606 ger*8 out[1m(1))
607 integer function nf_put_var_uint64(integer ncid, integer varid, inte‐
609 ger*8 out[1m(1))
610 integer function nf_put_var_string(integer ncid, integer varid, charac‐
612 ter* out[1m(1))
613 Writes an entire netCDF variable (i.e. all the values). The
617 netCDF dataset must be open and in data mode. The type of the
618 data is specified in the function name, and it is converted to
619 the external type of the specified variable, if possible, other‐
620 wise an NF_ERANGE error is returned. Note that rounding is not
621 performed during the conversion. Floating point numbers are
622 truncated when converted to integers.
623 integer function nf_get_var_text(integer ncid, integer varid, charac‐
625 ter*(*) in)
626 integer function nf_get_var_int1(integer ncid, integer varid, integer*1
629 in[1m(1))
630 integer function nf_get_var_int2(integer ncid, integer varid, integer*2
632 in[1m(1))
633 integer function nf_get_var_int(integer ncid, integer varid, integer
635 in[1m(1))
636 integer function nf_get_var_real(integer ncid, integer varid, real
639 in[1m(1))
640 integer function nf_get_var_double(integer ncid, integer varid, double‐
642 precision in[1m(1))
643 integer function nf_get_var_ubyte(integer ncid, integer varid, inte‐
645 ger*1 in[1m(1))
646 integer function nf_get_var_ushort(integer ncid, integer varid, inte‐
648 ger*2 in[1m(1))
649 integer function nf_get_var_uint(integer ncid, integer varid, integer*4
651 in[1m(1))
652 integer function nf_get_var_int64(integer ncid, integer varid, inte‐
654 ger*8 in[1m(1))
655 integer function nf_get_var_uint64(integer ncid, integer varid, inte‐
657 ger*8 in[1m(1))
658 integer function nf_get_var_string(integer ncid, integer varid, charac‐
660 ter* in[1m(1))
661 Reads an entire netCDF variable (i.e. all the values). The
665 netCDF dataset must be open and in data mode. The data is con‐
666 verted from the external type of the specified variable, if nec‐
667 essary, to the type specified in the function name. If conver‐
668 sion is not possible, an NF_ERANGE error is returned.
669
671 integer function nf_put_var1_text(integer ncid, integer varid, integer
672 index[1m(1), character*1 *out)
673 integer function nf_put_var1_int1(integer ncid, integer varid, integer
676 index[1m(1), integer*1 *out)
677 integer function nf_put_var1_int2(integer ncid, integer varid, integer
679 index[1m(1), integer*2 *out)
680 integer function nf_put_var1_int(integer ncid, integer varid, integer
682 index[1m(1), integer *out)
683 integer function nf_put_var1_real(integer ncid, integer varid, integer
686 index[1m(1), real *out)
687 integer function nf_put_var1_double(integer ncid, integer varid, inte‐
689 ger index[1m(1), doubleprecision *out)
690 integer function nf_put_var1_ubyte(integer ncid, integer varid, integer
692 index[1m(1), integer*1 *out)
693 integer function nf_put_var1_ushort(integer ncid, integer varid, inte‐
695 ger index[1m(1), integer*2 *out)
696 integer function nf_put_var1_uint(integer ncid, integer varid, integer
698 index[1m(1), integer*4 *out)
699 integer function nf_put_var1_int64(integer ncid, integer varid, integer
701 index[1m(1), integer*8 *out)
702 integer function nf_put_var1_uint64(integer ncid, integer varid, inte‐
704 ger index[1m(1), integer*8 *out)
705 integer function nf_put_var1_string(integer ncid, integer varid, inte‐
707 ger index[1m(1), character* *out)
708 Puts a single data value into a variable at the position index
712 of an open netCDF dataset that is in data mode. The type of the
713 data is specified in the function name, and it is converted to
714 the external type of the specified variable, if possible, other‐
715 wise an NF_ERANGE error is returned.
716 integer function nf_get_var1_text(integer ncid, integer varid, integer
718 index[1m(1), character*1 in)
719 integer function nf_get_var1_int1(integer ncid, integer varid, integer
722 index[1m(1), integer*1 in)
723 integer function nf_get_var1_int2(integer ncid, integer varid, integer
725 index[1m(1), integer*2 in)
726 integer function nf_get_var1_int(integer ncid, integer varid, integer
728 index[1m(1), integer in)
729 integer function nf_get_var1_real(integer ncid, integer varid, integer
732 index[1m(1), real in)
733 integer function nf_get_var1_double(integer ncid, integer varid, inte‐
735 ger index[1m(1), doubleprecision in)
736 integer function nf_get_var1_ubyte(integer ncid, integer varid, integer
738 index[1m(1), integer*1 in)
739 integer function nf_get_var1_ushort(integer ncid, integer varid, inte‐
741 ger index[1m(1), integer*2 in)
742 integer function nf_get_var1_uint(integer ncid, integer varid, integer
744 index[1m(1), integer*4 in)
745 integer function nf_get_var1_int64(integer ncid, integer varid, integer
747 index[1m(1), integer*8 in)
748 integer function nf_get_var1_uint64(integer ncid, integer varid, inte‐
750 ger index[1m(1), integer*8 in)
751 integer function nf_get_var1_string(integer ncid, integer varid, inte‐
753 ger index[1m(1), character* in)
754 Gets a single data value from a variable at the position index
758 of an open netCDF dataset that is in data mode. The data is
759 converted from the external type of the specified variable, if
760 necessary, to the type specified in the function name. If con‐
761 version is not possible, an NF_ERANGE error is returned.
762
764 integer function nf_put_vara_text(integer ncid, integer varid, integer
765 start[1m(1), integer count[1m(1), character*(*) out)
766 integer function nf_put_vara_int1(integer ncid, integer varid, integer
769 start[1m(1), integer count[1m(1), integer*1 out[1m(1))
770 integer function nf_put_vara_int2(integer ncid, integer varid, integer
772 start[1m(1), integer count[1m(1), integer*2 out[1m(1))
773 integer function nf_put_vara_int(integer ncid, integer varid, integer
775 start[1m(1), integer count[1m(1), integer out[1m(1))
776 integer function nf_put_vara_real(integer ncid, integer varid, integer
779 start[1m(1), integer count[1m(1), real out[1m(1))
780 integer function nf_put_vara_double(integer ncid, integer varid, inte‐
782 ger start[1m(1), integer count[1m(1), doubleprecision out[1m(1))
783 integer function nf_put_vara_ubyte(integer ncid, integer varid, integer
785 start[1m(1), integer count[1m(1), integer*1 out[1m(1))
786 integer function nf_put_vara_ushort(integer ncid, integer varid, inte‐
788 ger start[1m(1), integer count[1m(1), integer*2 out[1m(1))
789 integer function nf_put_vara_uint(integer ncid, integer varid, integer
791 start[1m(1), integer count[1m(1), integer*4 out[1m(1))
792 integer function nf_put_vara_int64(integer ncid, integer varid, integer
794 start[1m(1), integer count[1m(1), integer*8 out[1m(1))
795 integer function nf_put_vara_uint64(integer ncid, integer varid, inte‐
797 ger start[1m(1), integer count[1m(1), integer*8 out[1m(1))
798 integer function nf_put_vara_string(integer ncid, integer varid, inte‐
800 ger start[1m(1), integer count[1m(1), character* out[1m(1))
801 Writes an array section of values into a netCDF variable of an
805 open netCDF dataset, which must be in data mode. The array sec‐
806 tion is specified by the start and count vectors, which give the
807 starting index and count of values along each dimension of the
808 specified variable. The type of the data is specified in the
809 function name and is converted to the external type of the spec‐
810 ified variable, if possible, otherwise an NF_ERANGE error is re‐
811 turned.
812 integer function nf_get_vara_text(integer ncid, integer varid, integer
814 start[1m(1), integer count[1m(1), character*(*) in)
815 integer function nf_get_vara_int1(integer ncid, integer varid, integer
818 start[1m(1), integer count[1m(1), integer*1 in[1m(1))
819 integer function nf_get_vara_int2(integer ncid, integer varid, integer
821 start[1m(1), integer count[1m(1), integer*2 in[1m(1))
822 integer function nf_get_vara_int(integer ncid, integer varid, integer
824 start[1m(1), integer count[1m(1), integer in[1m(1))
825 integer function nf_get_vara_real(integer ncid, integer varid, integer
828 start[1m(1), integer count[1m(1), real in[1m(1))
829 integer function nf_get_vara_double(integer ncid, integer varid, inte‐
831 ger start[1m(1), integer count[1m(1), doubleprecision in[1m(1))
832 integer function nf_get_vara_ubyte(integer ncid, integer varid, integer
834 start[1m(1), integer count[1m(1), integer*1 in[1m(1))
835 integer function nf_get_vara_ushort(integer ncid, integer varid, inte‐
837 ger start[1m(1), integer count[1m(1), integer*2 in[1m(1))
838 integer function nf_get_vara_uint(integer ncid, integer varid, integer
840 start[1m(1), integer count[1m(1), integer*4 in[1m(1))
841 integer function nf_get_vara_int64(integer ncid, integer varid, integer
843 start[1m(1), integer count[1m(1), integer*8 in[1m(1))
844 integer function nf_get_vara_uint64(integer ncid, integer varid, inte‐
846 ger start[1m(1), integer count[1m(1), integer*8 in[1m(1))
847 integer function nf_get_vara_string(integer ncid, integer varid, inte‐
849 ger start[1m(1), integer count[1m(1), character* in[1m(1))
850 Reads an array section of values from a netCDF variable of an
854 open netCDF dataset, which must be in data mode. The array sec‐
855 tion is specified by the start and count vectors, which give the
856 starting index and count of values along each dimension of the
857 specified variable. The data is converted from the external
858 type of the specified variable, if necessary, to the type speci‐
859 fied in the function name. If conversion is not possible, an
860 NF_ERANGE error is returned.
861
863 integer function nf_put_vars_text(integer ncid, integer varid, integer
864 start[1m(1), integer count[1m(1), integer stride[1m(1), character*(*)
865 out)
866 integer function nf_put_vars_int1(integer ncid, integer varid, integer
869 start[1m(1), integer count[1m(1), integer stride[1m(1), integer*1 out[1m(1))
870 integer function nf_put_vars_int2(integer ncid, integer varid, integer
872 start[1m(1), integer count[1m(1), integer stride[1m(1), integer*2 out[1m(1))
873 integer function nf_put_vars_int(integer ncid, integer varid, integer
875 start[1m(1), integer count[1m(1), integer stride[1m(1), integer out[1m(1))
876 integer function nf_put_vars_real(integer ncid, integer varid, integer
879 start[1m(1), integer count[1m(1), integer stride[1m(1), real out[1m(1))
880 integer function nf_put_vars_double(integer ncid, integer varid, inte‐
882 ger start[1m(1), integer count[1m(1), integer stride[1m(1), doublepreci‐
883 sion out[1m(1))
884 integer function nf_put_vars_ubyte(integer ncid, integer varid, integer
886 start[1m(1), integer count[1m(1), integer stride[1m(1), integer*1 out[1m(1))
887 integer function nf_put_vars_ushort(integer ncid, integer varid, inte‐
889 ger start[1m(1), integer count[1m(1), integer stride[1m(1), integer*2
890 out[1m(1))
891 integer function nf_put_vars_uint(integer ncid, integer varid, integer
893 start[1m(1), integer count[1m(1), integer stride[1m(1), integer*4 out[1m(1))
894 integer function nf_put_vars_int64(integer ncid, integer varid, integer
896 start[1m(1), integer count[1m(1), integer stride[1m(1), integer*8 out[1m(1))
897 integer function nf_put_vars_uint64(integer ncid, integer varid, inte‐
899 ger start[1m(1), integer count[1m(1), integer stride[1m(1), integer*8
900 out[1m(1))
901 integer function nf_put_vars_string(integer ncid, integer varid, inte‐
903 ger start[1m(1), integer count[1m(1), integer stride[1m(1), character*
904 out[1m(1))
905 These functions are used for strided output, which is like the
909 array section output described above, except that the sampling
910 stride (the interval between accessed values) is specified for
911 each dimension. For an explanation of the sampling stride vec‐
912 tor, see COMMON ARGUMENTS DESCRIPTIONS below.
913 integer function nf_get_vars_text(integer ncid, integer varid, integer
915 start[1m(1), integer count[1m(1), integer stride[1m(1), character*(*) in)
916 integer function nf_get_vars_int1(integer ncid, integer varid, integer
919 start[1m(1), integer count[1m(1), integer stride[1m(1), integer*1 in[1m(1))
920 integer function nf_get_vars_int2(integer ncid, integer varid, integer
922 start[1m(1), integer count[1m(1), integer stride[1m(1), integer*2 in[1m(1))
923 integer function nf_get_vars_int(integer ncid, integer varid, integer
925 start[1m(1), integer count[1m(1), integer stride[1m(1), integer in[1m(1))
926 integer function nf_get_vars_real(integer ncid, integer varid, integer
929 start[1m(1), integer count[1m(1), integer stride[1m(1), real in[1m(1))
930 integer function nf_get_vars_double(integer ncid, integer varid, inte‐
932 ger start[1m(1), integer count[1m(1), integer stride[1m(1), doublepreci‐
933 sion in[1m(1))
934 integer function nf_get_vars_ubyte(integer ncid, integer varid, integer
936 start[1m(1), integer count[1m(1), integer stride[1m(1), integer*1 in[1m(1))
937 integer function nf_get_vars_ushort(integer ncid, integer varid, inte‐
939 ger start[1m(1), integer count[1m(1), integer stride[1m(1), integer*2
940 in[1m(1))
941 integer function nf_get_vars_uint(integer ncid, integer varid, integer
943 start[1m(1), integer count[1m(1), integer stride[1m(1), integer*4 in[1m(1))
944 integer function nf_get_vars_int64(integer ncid, integer varid, integer
946 start[1m(1), integer count[1m(1), integer stride[1m(1), integer*8 in[1m(1))
947 integer function nf_get_vars_uint64(integer ncid, integer varid, inte‐
949 ger start[1m(1), integer count[1m(1), integer stride[1m(1), integer*8
950 in[1m(1))
951 integer function nf_get_vars_string(integer ncid, integer varid, inte‐
953 ger start[1m(1), integer count[1m(1), integer stride[1m(1), character*
954 in[1m(1))
955 These functions are used for strided input, which is like the
959 array section input described above, except that the sampling
960 stride (the interval between accessed values) is specified for
961 each dimension. For an explanation of the sampling stride vec‐
962 tor, see COMMON ARGUMENTS DESCRIPTIONS below.
963
965 integer function nf_put_varm_text(integer ncid, integer varid, integer
966 start[1m(1), integer count[1m(1), integer stride[1m(1), imap, charac‐
967 ter*(*) out)
968 integer function nf_put_varm_int1(integer ncid, integer varid, integer
971 start[1m(1), integer count[1m(1), integer stride[1m(1), imap, integer*1
972 out[1m(1))
973 integer function nf_put_varm_int2(integer ncid, integer varid, integer
975 start[1m(1), integer count[1m(1), integer stride[1m(1), imap, integer*2
976 out[1m(1))
977 integer function nf_put_varm_int(integer ncid, integer varid, integer
979 start[1m(1), integer count[1m(1), integer stride[1m(1), imap, integer
980 out[1m(1))
981 integer function nf_put_varm_real(integer ncid, integer varid, integer
984 start[1m(1), integer count[1m(1), integer stride[1m(1), imap, real
985 out[1m(1))
986 integer function nf_put_varm_double(integer ncid, integer varid, inte‐
988 ger start[1m(1), integer count[1m(1), integer stride[1m(1), imap, double‐
989 precision out[1m(1))
990 integer function nf_put_varm_ubyte(integer ncid, integer varid, integer
992 start[1m(1), integer count[1m(1), integer stride[1m(1), imap, integer*1
993 out[1m(1))
994 integer function nf_put_varm_ushort(integer ncid, integer varid, inte‐
996 ger start[1m(1), integer count[1m(1), integer stride[1m(1), imap, inte‐
997 ger*2 out[1m(1))
998 integer function nf_put_varm_uint(integer ncid, integer varid, integer
1000 start[1m(1), integer count[1m(1), integer stride[1m(1), imap, integer*4
1001 out[1m(1))
1002 integer function nf_put_varm_int64(integer ncid, integer varid, integer
1004 start[1m(1), integer count[1m(1), integer stride[1m(1), imap, integer*8
1005 out[1m(1))
1006 integer function nf_put_varm_uint64(integer ncid, integer varid, inte‐
1008 ger start[1m(1), integer count[1m(1), integer stride[1m(1), imap, inte‐
1009 ger*8 out[1m(1))
1010 integer function nf_put_varm_string(integer ncid, integer varid, inte‐
1012 ger start[1m(1), integer count[1m(1), integer stride[1m(1), imap, charac‐
1013 ter* out[1m(1))
1014 These functions are used for mapped output, which is like strid‐
1018 ed output described above, except that an additional index map‐
1019 ping vector is provided to specify the in-memory arrangement of
1020 the data values. For an explanation of the index mapping vec‐
1021 tor, see COMMON ARGUMENTS DESCRIPTIONS below.
1022 integer function nf_get_varm_text(integer ncid, integer varid, integer
1024 start[1m(1), integer count[1m(1), integer stride[1m(1), imap, charac‐
1025 ter*(*) in)
1026 integer function nf_get_varm_int1(integer ncid, integer varid, integer
1029 start[1m(1), integer count[1m(1), integer stride[1m(1), imap, integer*1
1030 in[1m(1))
1031 integer function nf_get_varm_int2(integer ncid, integer varid, integer
1033 start[1m(1), integer count[1m(1), integer stride[1m(1), imap, integer*2
1034 in[1m(1))
1035 integer function nf_get_varm_int(integer ncid, integer varid, integer
1037 start[1m(1), integer count[1m(1), integer stride[1m(1), imap, integer
1038 in[1m(1))
1039 integer function nf_get_varm_real(integer ncid, integer varid, integer
1042 start[1m(1), integer count[1m(1), integer stride[1m(1), imap, real in[1m(1))
1043 integer function nf_get_varm_double(integer ncid, integer varid, inte‐
1045 ger start[1m(1), integer count[1m(1), integer stride[1m(1), imap, double‐
1046 precision in[1m(1))
1047 integer function nf_get_varm_ubyte(integer ncid, integer varid, integer
1049 start[1m(1), integer count[1m(1), integer stride[1m(1), imap, integer*1
1050 in[1m(1))
1051 integer function nf_get_varm_ushort(integer ncid, integer varid, inte‐
1053 ger start[1m(1), integer count[1m(1), integer stride[1m(1), imap, inte‐
1054 ger*2 in[1m(1))
1055 integer function nf_get_varm_uint(integer ncid, integer varid, integer
1057 start[1m(1), integer count[1m(1), integer stride[1m(1), imap, integer*4
1058 in[1m(1))
1059 integer function nf_get_varm_int64(integer ncid, integer varid, integer
1061 start[1m(1), integer count[1m(1), integer stride[1m(1), imap, integer*8
1062 in[1m(1))
1063 integer function nf_get_varm_uint64(integer ncid, integer varid, inte‐
1065 ger start[1m(1), integer count[1m(1), integer stride[1m(1), imap, inte‐
1066 ger*8 in[1m(1))
1067 integer function nf_get_varm_string(integer ncid, integer varid, inte‐
1069 ger start[1m(1), integer count[1m(1), integer stride[1m(1), imap, charac‐
1070 ter* in[1m(1))
1071 These functions are used for mapped input, which is like strided
1075 input described above, except that an additional index mapping
1076 vector is provided to specify the in-memory arrangement of the
1077 data values. For an explanation of the index mapping vector,
1078 see COMMON ARGUMENTS DESCRIPTIONS below.
1079
1081 integer function nf_put_att_text(integer ncid, integer varid, charac‐
1082 ter*(*) name, integer xtype, integer len, character*(*) out)
1083 integer function nf_put_att_int1(integer ncid, integer varid, charac‐
1086 ter*(*) name, integer xtype, integer len, integer*1 out[1m(1))
1087 integer function nf_put_att_int2(integer ncid, integer varid, charac‐
1089 ter*(*) name, integer xtype, integer len, integer*2 out[1m(1))
1090 integer function nf_put_att_int(integer ncid, integer varid, charac‐
1092 ter*(*) name, integer xtype, integer len, integer out[1m(1))
1093 integer function nf_put_att_real(integer ncid, integer varid, charac‐
1096 ter*(*) name, integer xtype, integer len, real out[1m(1))
1097 integer function nf_put_att_double(integer ncid, integer varid, charac‐
1099 ter*(*) name, integer xtype, integer len, doubleprecision
1100 out[1m(1))
1101 integer function nf_put_att_ubyte(integer ncid, integer varid, charac‐
1103 ter*(*) name, integer xtype, integer len, integer*1 out[1m(1))
1104 integer function nf_put_att_ushort(integer ncid, integer varid, charac‐
1106 ter*(*) name, integer xtype, integer len, integer*2 out[1m(1))
1107 integer function nf_put_att_uint(integer ncid, integer varid, charac‐
1109 ter*(*) name, integer xtype, integer len, integer*4 out[1m(1))
1110 integer function nf_put_att_int64(integer ncid, integer varid, charac‐
1112 ter*(*) name, integer xtype, integer len, integer*8 out[1m(1))
1113 integer function nf_put_att_uint64(integer ncid, integer varid, charac‐
1115 ter*(*) name, integer xtype, integer len, integer*8 out[1m(1))
1116 integer function nf_put_att_string(integer ncid, integer varid, charac‐
1118 ter*(*) name, integer xtype, integer len, character* out[1m(1))
1119 integer function nf_put_att(integer ncid, integer varid, character*(*)
1123 name, integer xtype, integer len, void * ip)
1124 integer function nf_get_att(integer ncid, integer varid, character*(*)
1126 name, void * ip)
1127 Unlike variables, attributes do not have separate functions for
1129 defining and writing values. This family of functions defines a
1130 new attribute with a value or changes the value of an existing
1131 attribute. If the attribute is new, or if the space required to
1132 store the attribute value is greater than before, the netCDF
1133 dataset must be in define mode. The parameter len is the number
1134 of values from out to transfer. It is often one, except that
1135 for nf_put_att_text() it will usually be len_trim(out).
1136 For these functions, the type component of the function name
1138 refers to the in-memory type of the value, whereas the xtype ar‐
1139 gument refers to the external type for storing the value. An
1140 NF_ERANGE error results if a conversion between these types is
1141 not possible. In this case the value is represented with the
1142 appropriate fill-value for the associated external type.
1143 integer function nf_inq_attname(integer ncid, integer varid, integer
1145 attnum, character*(*) name)
1146 Gets the name of an attribute, given its variable ID and at‐
1148 tribute number. This function is useful in generic applications
1149 that need to get the names of all the attributes associated with
1150 a variable, since attributes are accessed by name rather than
1151 number in all other attribute functions. The number of an at‐
1152 tribute is more volatile than the name, since it can change when
1153 other attributes of the same variable are deleted. The at‐
1154 tributes for each variable are numbered from 1 (the first at‐
1155 tribute) to nvatts, where nvatts is the number of attributes for
1156 the variable, as returned from a call to nf_inq_varnatts().
1157 integer function nf_inq_att(integer ncid, integer varid, character*(*)
1160 name, integer xtype, integer len)
1161 integer function nf_inq_attid(integer ncid, integer varid, charac‐
1163 ter*(*) name, integer attnum)
1164 integer function nf_inq_atttype(integer ncid, integer varid, charac‐
1166 ter*(*) name, integer xtype)
1167 integer function nf_inq_attlen(integer ncid, integer varid, charac‐
1169 ter*(*) name, integer len)
1170 These functions return information about a netCDF attribute,
1172 given its variable ID and name. The information returned is the
1173 external type in xtype and the number of elements in the at‐
1174 tribute as len.
1175 integer function nf_copy_att(integer ncid, integer varid_in, charac‐
1178 ter*(*) name, integer ncid_out, integer varid_out)
1179 Copies an attribute from one netCDF dataset to another. It can
1181 also be used to copy an attribute from one variable to another
1182 within the same netCDF. ncid_in is the netCDF ID of an input
1183 netCDF dataset from which the attribute will be copied.
1184 varid_in is the ID of the variable in the input netCDF dataset
1185 from which the attribute will be copied, or NF_GLOBAL for a
1186 global attribute. name is the name of the attribute in the in‐
1187 put netCDF dataset to be copied. ncid_out is the netCDF ID of
1188 the output netCDF dataset to which the attribute will be copied.
1189 It is permissible for the input and output netCDF ID's to be the
1190 same. The output netCDF dataset should be in define mode if the
1191 attribute to be copied does not already exist for the target
1192 variable, or if it would cause an existing target attribute to
1193 grow. varid_out is the ID of the variable in the output netCDF
1194 dataset to which the attribute will be copied, or NF_GLOBAL to
1195 copy to a global attribute.
1196 integer function nf_rename_att(integer ncid, integer varid, charac‐
1198 ter*(*) name, character*(*) newname)
1199 Changes the name of an attribute. If the new name is longer
1201 than the original name, the netCDF must be in define mode. You
1202 cannot rename an attribute to have the same name as another at‐
1203 tribute of the same variable. name is the original attribute
1204 name. newname is the new name to be assigned to the specified
1205 attribute. If the new name is longer than the old name, the
1206 netCDF dataset must be in define mode.
1207 integer function nf_del_att(integer ncid, integer varid, character*(*)
1209 name)
1210 Deletes an attribute from a netCDF dataset. The dataset must be
1212 in define mode.
1213 integer function nf_get_att_text(integer ncid, integer varid, charac‐
1215 ter*(*) name, character*(*) in)
1216 integer function nf_get_att_int1(integer ncid, integer varid, charac‐
1219 ter*(*) name, integer*1 in[1m(1))
1220 integer function nf_get_att_int2(integer ncid, integer varid, charac‐
1222 ter*(*) name, integer*2 in[1m(1))
1223 integer function nf_get_att_int(integer ncid, integer varid, charac‐
1225 ter*(*) name, integer in[1m(1))
1226 integer function nf_get_att_real(integer ncid, integer varid, charac‐
1229 ter*(*) name, real in[1m(1))
1230 integer function nf_get_att_double(integer ncid, integer varid, charac‐
1232 ter*(*) name, doubleprecision in[1m(1))
1233 integer function nf_get_att_ubyte(integer ncid, integer varid, charac‐
1235 ter*(*) name, integer*1 in[1m(1))
1236 integer function nf_get_att_ushort(integer ncid, integer varid, charac‐
1238 ter*(*) name, integer*2 in[1m(1))
1239 integer function nf_get_att_uint(integer ncid, integer varid, charac‐
1241 ter*(*) name, integer*4 in[1m(1))
1242 integer function nf_get_att_int64(integer ncid, integer varid, charac‐
1244 ter*(*) name, integer*8 in[1m(1))
1245 integer function nf_get_att_uint64(integer ncid, integer varid, charac‐
1247 ter*(*) name, integer*8 in[1m(1))
1248 integer function nf_get_att_string(integer ncid, integer varid, charac‐
1250 ter*(*) name, character* in[1m(1))
1251 Gets the value(s) of a netCDF attribute, given its variable ID
1255 and name. Converts from the external type to the type specified
1256 in the function name, if possible, otherwise returns an
1257 NF_ERANGE error. All elements of the vector of attribute values
1258 are returned, so you must allocate enough space to hold them.
1259 If you don't know how much space to reserve, call nf_inq_at‐
1260 tlen() first to find out the length of the attribute.
1261
1263 In this section we define some common arguments which are used in the
1264 "FUNCTION DESCRIPTIONS" section.
1265 integer ncid
1267 is the netCDF ID returned from a previous, successful call to
1268 nf_open() or nf_create()
1269 character*(*) name
1271 is the name of a dimension, variable, or attribute. The names of
1272 dimensions, variables and attributes consist of arbitrary se‐
1273 quences of alphanumeric characters (as well as underscore '_',
1274 period '.' and hyphen '-'), beginning with a letter or under‐
1275 score. (However names commencing with underscore are reserved
1276 for system use.) Case is significant in netCDF names. A zero-
1277 length name is not allowed.
1278 The maximum allowable number of characters
1280 is NF_MAX_NAME.
1281 integer xtype
1283 specifies the external data type of a netCDF variable or at‐
1284 tribute and is one of the following: NF_BYTE, NF_CHAR, NF_SHORT,
1285 NF_INT, NF_FLOAT, or NF_DOUBLE. These are used to specify 8-bit
1286 integers, characters, 16-bit integers, 32-bit integers, 32-bit
1287 IEEE floating point numbers, and 64-bit IEEE floating-point num‐
1288 bers, respectively.
1289 integer dimids(1)
1292 is a vector of dimension ID's and defines the shape of a netCDF
1293 variable. The size of the vector shall be greater than or equal
1294 to the rank (i.e. the number of dimensions) of the variable
1295 (ndims). The vector shall be ordered by the speed with which a
1296 dimension varies: dimids(1) shall be the dimension ID of the
1297 most rapidly varying dimension and dimids(ndims) shall be the
1298 dimension ID of the most slowly varying dimension. The maximum
1299 possible number of dimensions for a variable is given by the
1300 symbolic constant NF_MAX_VAR_DIMS.
1301 integer dimid
1303 is the ID of a netCDF dimension. netCDF dimension ID's are al‐
1304 located sequentially from the positive integers beginning with
1305 1.
1306 integer ndims
1308 is either the total number of dimensions in a netCDF dataset or
1309 the rank (i.e. the number of dimensions) of a netCDF variable.
1310 The value shall not be negative or greater than the symbolic
1311 constant NF_MAX_VAR_DIMS.
1312 integer varid
1314 is the ID of a netCDF variable or (for the attribute-access
1315 functions) the symbolic constant NF_GLOBAL, which is used to
1316 reference global attributes. netCDF variable ID's are allocated
1317 sequentially from the positive integers beginning with 1.
1318 integer natts
1320 is the number of global attributes in a netCDF dataset for the
1321 nf_inquire() function or the number of attributes associated
1322 with a netCDF variable for the nf_varinq() function.
1323 integer index(1)
1325 specifies the indicial coordinates of the netCDF data value to
1326 be accessed. The indices start at 1; thus, for example, the
1327 first data value of a two-dimensional variable is (1,1). The
1328 size of the vector shall be at least the rank of the associated
1329 netCDF variable and its elements shall correspond, in order, to
1330 the variable's dimensions.
1331 integer start(1)
1333 specifies the starting point for accessing a netCDF variable's
1334 data values in terms of the indicial coordinates of the corner
1335 of the array section. The indices start at 1; thus, the first
1336 data value of a variable is (1, 1, ..., 1). The size of the
1337 vector shall be at least the rank of the associated netCDF vari‐
1338 able and its elements shall correspond, in order, to the vari‐
1339 able's dimensions.
1340 integer count(1)
1342 specifies the number of indices selected along each dimension of
1343 the array section. Thus, to access a single value, for example,
1344 specify count as (1, 1, ..., 1). Note that, for strided I/O,
1345 this argument must be adjusted to be compatible with the stride
1346 and start arguments so that the interaction of the three does
1347 not attempt to access an invalid data co-ordinate. The elements
1348 of the count vector correspond, in order, to the variable's di‐
1349 mensions.
1350 integer stride(1)
1352 specifies the sampling interval along each dimension of the
1353 netCDF variable. The elements of the stride vector correspond,
1354 in order, to the netCDF variable's dimensions (stride(1)) gives
1355 the sampling interval along the most rapidly varying dimension
1356 of the netCDF variable). Sampling intervals are specified in
1357 type-independent units of elements (a value of 1 selects consec‐
1358 utive elements of the netCDF variable along the corresponding
1359 dimension, a value of 2 selects every other element, etc.).
1360 imap specifies the mapping between the dimensions of a netCDF vari‐
1363 able and the in-memory structure of the internal data array.
1364 The elements of the index mapping vector correspond, in order,
1365 to the netCDF variable's dimensions (imap(1) gives the distance
1366 between elements of the internal array corresponding to the most
1367 rapidly varying dimension of the netCDF variable). Distances
1368 between elements are specified in type-independent units of ele‐
1369 ments (the distance between internal elements that occupy adja‐
1370 cent memory locations is 1 and not the element's byte-length as
1371 in netCDF 2).
1372
1375 By default, the netCDF interface sets the values of all newly-defined
1376 variables of finite length (i.e. those that do not have an unlimited,
1377 dimension) to the type-dependent fill-value associated with each vari‐
1378 able. This is done when nf_enddef() is called. The fill-value for a
1379 variable may be changed from the default value by defining the at‐
1380 tribute `_FillValue' for the variable. This attribute must have the
1381 same type as the variable and be of length one.
1382 Variables with an unlimited dimension are also prefilled, but on an `as
1384 needed' basis. For example, if the first write of such a variable is
1385 to position 5, then positions 1 through 4 (and no others) would be set
1386 to the fill-value at the same time.
1387 This default prefilling of data values may be disabled by or'ing the
1389 NF_NOFILL flag into the mode parameter of nf_open() or nf_create(), or,
1390 by calling the function nf_set_fill() with the argument NF_NOFILL. For
1391 variables that do not use the unlimited dimension, this call must be
1392 made before nf_enddef(). For variables that use the unlimited dimen‐
1393 sion, this call may be made at any time.
1394 One can obtain increased performance of the netCDF interface by using
1396 this feature, but only at the expense of requiring the application to
1397 set every single data value. The performance enhancing behavior of
1398 this function is dependent on the particulars of the implementation and
1399 dataset format. The flag value controlled by nf_set_fill() is per
1400 netCDF ID, not per variable or per write. Allowing this to change af‐
1401 fects the degree to which a program can be effectively parallelized.
1402 Given all of this, we state that the use of this feature may not be
1403 available (or even needed) in future releases. Programmers are cau‐
1404 tioned against heavy reliance upon this feature.
1405 integer function nf_setfill(integer ncid, integer fillmode, integer
1407 old_fillemode)
1408 Determines whether or not variable prefilling will be done (see
1411 above). The netCDF dataset shall be writable. fillmode is ei‐
1412 ther NF_FILL to enable prefilling (the default) or NF_NOFILL to
1413 disable prefilling. This function returns the previous setting
1414 in old_fillmode.
1415
1420 Additional functions for use on SGI/Cray MPP machines (_CRAYMPP).
1421 These are used to set and inquire which PE is the base for MPP for a
1422 particular netCDF. These are only relevant when using the SGI/Cray
1423 ``global'' Flexible File I/O layer and desire to have only a subset of
1424 PEs to open the specific netCDF file. For technical reasons, these
1425 functions are available on all platforms. On a platform other than
1426 SGI/Cray MPP, it is as if only processor available were processor 0.
1427 To use this feature, you need to specify a communicator group and call
1429 glio_group_mpi() or glio_group_shmem() prior to the netCDF nf_open()
1430 and nf_create() calls.
1431 integer function nf__create_mp(character*(*) path, integer cmode, inte‐
1433 ger initialsize, integer pe, integer chunksize, integer ncid)
1434 Like nf__create() but allows the base PE to be set.
1436 The argument pe sets the base PE at creation time. In the MPP
1438 environment, nf__create() and nf_create() set the base PE to
1439 processor zero by default.
1440 integer function nf__open_mp(character*(*) path, integer mode, integer
1442 pe, integer chunksize, integer ncid)
1443 Like nf__open() but allows the base PE to be set. The argument
1445 pe sets the base PE at creation time. In the MPP environment,
1446 nf__open() and nf_open() set the base PE to processor zero by
1447 default.
1448 integer function nf_inq_base_pe(integer ncid, integer pe)
1450 Inquires of the netCDF dataset which PE is being used as the
1452 base for MPP use. This is safe to use at any time.
1453 integer function nf_set_base_pe(integer ncid, integer pe)
1455 Resets the base PE for the netCDF dataset. Only perform this
1457 operation when the affected communicator group synchronizes be‐
1458 fore and after the call. This operation is very risky and
1459 should only be contemplated under only the most extreme cases.
1460
1462 NETCDF_FFIOSPEC
1463 Specifies the Flexible File I/O buffers for netCDF I/O when execut‐
1464 ing under the UNICOS operating system (the variable is ignored on
1465 other operating systems). An appropriate specification can greatly
1466 increase the efficiency of netCDF I/O -- to the extent that it can
1467 actually surpass FORTRAN binary I/O. This environment variable has
1468 been made a little more generalized, such that other FFIO option
1469 specifications can now be added. The default specification is bu‐
1470 fa:336:2, unless a current FFIO specification is in operation,
1471 which will be honored. See UNICOS Flexible File I/O for more in‐
1472 formation.
1473
1475 Both a mailing list and a digest are available for discussion of the
1476 netCDF interface and announcements about netCDF bugs, fixes, and en‐
1477 hancements. To begin or change your subscription to either the mail‐
1478 ing-list or the digest, send one of the following in the body (not the
1479 subject line) of an email message to "majordomo@unidata.ucar.edu". Use
1480 your email address in place of jdoe@host.inst.domain.
1481 To subscribe to the netCDF mailing list:
1483 subscribe netcdfgroup jdoe@host.inst.domain
1484 To unsubscribe from the netCDF mailing list:
1485 unsubscribe netcdfgroup jdoe@host.inst.domain
1486 To subscribe to the netCDF digest:
1487 subscribe netcdfdigest jdoe@host.inst.domain
1488 To unsubscribe from the netCDF digest:
1489 unsubscribe netcdfdigest jdoe@host.inst.domain
1490 To retrieve the general introductory information for the mailing list:
1491 info netcdfgroup
1492 To get a synopsis of other majordomo commands:
1493 help
1494
1496 ncdump(1), ncgen(1), netcdf(3f).
1497 netCDF User's Guide, published by the Unidata Program Center, Universi‐
1499 ty Corporation for Atmospheric Research, located in Boulder, Colorado.
1500 NetCDF home page at http:/www.unidata.ucar.edu/netcdf.
1502Printed: 2020-05-10 1997-04-18 NETCDF(3)