1NCAP(1)                     General Commands Manual                    NCAP(1)
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NAME

6       ncap - netCDF Arithmetic Processor
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SYNTAX

9       ncap  [-A]  [-C]  [-c] [-D dbg] [-d dim,[ min][,[ max]]] [-F] [-f] [-h]
10       [-l path] [-O] [-o output-file] [-p path] [-R] [-r] [-S script-file][-s
11       script][-v var[,...]]  input-file [ output-file ]
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DESCRIPTION

14       ncap  arithmetically  processes a netCDF file.  The processing instruc‐
15       tions are contained either in the  NCO  script  file  fl.nco  or  in  a
16       sequence  of  command  line arguments.  The options -s (or long options
17       --spt or --script) are used for in-line scripts and -S (or long options
18       --fl_spt or --script-file) are used to provide the filename where (usu‐
19       ally multiple) scripting commands are pre-stored.  ncap was written  to
20       perform  arbitrary  albebraic  transformations  of data and archive the
21       results as easily as possible.  Missing values are  treated  correctly.
22       The results of the algebraic manipulations are called derived fields.
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24       Unlike the other operators, ncap does not accept a list of variables to
25       be operated on as an argument to -v.  Rather, the -v  switch  takes  no
26       arguments and indicates that ncap should output only user-defined vari‐
27       ables.  ncap does not accept or understand the -x switch.
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EXAMPLES

30       Compute the square of variable T
31              ncap -s "T2=T*T" in.nc out.nc
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AUTHOR

35       NCO manual pages written by Charlie Zender and Brian Mays.
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REPORTING BUGS

39       Report bugs to <http://sf.net/bugs/?group_id=3331>.
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43       Copyright © 1995-2004 Charlie Zender
44       This is free software; see the source for copying conditions.  There is
45       NO  warranty;  not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
46       PURPOSE.
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SEE ALSO

50       The full documentation for NCO is maintained as a Texinfo manual called
51       the NCO User's Guide.  Because NCO is mathematical in nature, the docu‐
52       mentation includes TeX-intensive portions not  viewable  on  character-
53       based  displays.  Hence the only complete and authoritative versions of
54       the NCO User's Guide are the PDF  (recommended),  DVI,  and  Postscript
55       versions  at  <http://nco.sf.net/nco.pdf>, <http://nco.sf.net/nco.dvi>,
56       and <http://nco.sf.net/nco.ps>, respectively.  HTML  and  XML  versions
57       are       available       at      <http://nco.sf.net/nco.html>      and
58       <http://nco.sf.net/nco.xml>, respectively.
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60       If the info and NCO programs are properly installed at your  site,  the
61       command
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63              info nco
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65       should  give  you  access  to  the complete manual, except for the TeX-
66       intensive portions.
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HOMEPAGE

70       The NCO homepage at <http://nco.sf.net> contains more information.
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