1NCECAT(1) General Commands Manual NCECAT(1)
2
6 ncecat - netCDF Ensemble Concatenator
7
9 ncecat [-3] [-4] [-5] [-6] [-7] [-A] [--bfr sz_byt][-C][-c][--cnk_byt
10 sz_byt][--cnk_csh sz_byt][--cnk_dmn nm,sz_lmn] [--cnk_map map]
11 [--cnk_min sz_byt] [--cnk_plc plc] [--cnk_scl sz_lmn][-D dbg_lvl] [-d
12 dim,[ min][,[ max]]] [-F] [--fl_fmt=fmt] [-G gpe_dsc] [-g grp[,...]]
13 [--gag] [--glb att_name= att_val]] [-h] [--hdr_pad sz_byt] [-L dfl_lvl]
14 [-l path] [-M] [--mrd] [--msa] [-n loop] [--no_cll_msr] [--no_frm_trm]
15 [--no_tmp_fl] [-O] [-p path] [--ppc var1[, var2[,...]]= prc]] [-R] [-r]
16 [--ram_all] [-t thr_nbr] [-u ulm_nm] [--unn] [-v var[,...]] [-X box]
17 [-x] input-files output-file
18
20 ncecat concatenates an arbitrary number of input files into a single
21 output file. Input files are glued together by creating a record
22 dimension in the output file. Input files must be the same size. Each
23 input file is stored consecutively as a single record in the output
24 file. Each variable (except coordinate variables) in each input file
25 becomes one record in the same variable in the output file. Coordinate
26 variables are not concatenated, they are instead simply copied from the
27 first input file to the output-file. Thus, the size of the output file
28 is the sum of the sizes of the input files.
29 Consider five realizations, 85a.nc, 85b.nc,... 85e.nc of 1985 predic‐
31 tions from the same climate model. Then ncecat 85?.nc 85_ens.nc glues
32 the individual realizations together into the single file, 85_ens.nc.
33 If an input variable was dimensioned [ lat, lon], it will have dimen‐
34 sions [ record, lat, lon] in the output file. A restriction of ncecat
35 is that the hyperslabs of the processed variables must be the same from
36 file to file. Normally this means all the input files are the same
37 size, and contain data on different realizations of the same variables.
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40 Consider a model experiment which generated five realizations of one
41 year of data, say 1985. You can imagine that the experimenter slightly
42 perturbs the initial conditions of the problem before generating each
43 new solution. Assume each file contains all twelve months (a seasonal
44 cycle) of data and we want to produce a single file containing all the
45 seasonal cycles. Here the numeric filename suffix denotes the experi‐
46 ment number (not the month):
47 ncecat 85_01.nc 85_02.nc 85_03.nc 85_04.nc 85_05.nc 85.nc
48 ncecat 85_0[1-5].nc 85.nc
49 ncecat -n 5,2,1 85_01.nc 85.nc
50 These three commands produce identical answers. The output file,
51 85.nc, is five times the size as a single input-file. It contains 60
52 months of data (which might or might not be stored in the record dimen‐
53 sion, depending on the input files).
54
57 NCO manual pages written by Charlie Zender and originally formatted by
58 Brian Mays.
59
62 Report bugs to <http://sf.net/bugs/?group_id=3331>.
63
66 Copyright © 1995-2018 Charlie Zender
67 This is free software; see the source for copying conditions. There is
68 NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
69 PURPOSE.
70
73 The full documentation for NCO is maintained as a Texinfo manual called
74 the NCO Users Guide. Because NCO is mathematical in nature, the docu‐
75 mentation includes TeX-intensive portions not viewable on character-
76 based displays. Hence the only complete and authoritative versions of
77 the NCO Users Guide are the PDF (recommended), DVI, and Postscript ver‐
78 sions at <http://nco.sf.net/nco.pdf>, <http://nco.sf.net/nco.dvi>, and
79 <http://nco.sf.net/nco.ps>, respectively. HTML and XML versions are
80 available at <http://nco.sf.net/nco.html> and
81 <http://nco.sf.net/nco.xml>, respectively.
82 If the info and NCO programs are properly installed at your site, the
84 command
85 info nco
87 should give you access to the complete manual, except for the TeX-
89 intensive portions.
90 ncap(1), ncap2(1), ncatted(1), ncbo(1), ncclimo(1), nces(1), ncecat(1),
92 ncflint(1), ncks(1), nco(1), ncpdq(1), ncra(1), ncrcat(1), ncremap(1),
93 ncrename(1), ncwa(1)
94
97 The NCO homepage at <http://nco.sf.net> contains more information.
98 NCECAT(1)