NCAP2(1) General Commands Manual NCAP2(1)NAME
ncap2 - netCDF Arithmetic Processor, Next Generation
SYNTAX
ncap2 [-3] [-4] [-6] [-A] [-C] [-c] [-D dbg] [-d dim,[ min][,[ max]]] [-F] [-f] [-h] [-l path] [-O] [-o output-file] [-p path] [-R] [-r]
[-S script-file][-s script][-t thr_nbr][-v var[,...]] input-file [ output-file ]
DESCRIPTION
ncap2 supercedes and is backwards-compatible with ncap which is now deprecated. Both operators arithmetically process netCDF files. The
primary ncap2 documentation is currently the sample script <http://nco.sf.net/ncap2.in> The remainder of this manpage is identical to the
ncap manpage.
The processing instructions are contained either in the NCO script file fl.nco or in a sequence of command line arguments. The options -s
(or long options --spt or --script) are used for in-line scripts and -S (or long options --fl_spt or --script-file) are used to provide the
filename where (usually multiple) scripting commands are pre-stored. ncap2 was written to perform arbitrary albebraic transformations of
data and archive the results as easily as possible. Missing values are treated correctly. The results of the algebraic manipulations are
called derived fields.
Unlike the other operators, ncap2 does not accept a list of variables to be operated on as an argument to -v. Rather, the -v switch takes
no arguments and indicates that ncap2 should output only user-defined variables. ncap2 does not accept or understand the -x switch.
EXAMPLES
Compute the square of variable T
ncap2 -s "T2=T*T" in.nc out.nc
AUTHOR
NCO manual pages written by Charlie Zender and Brian Mays.
REPORTING BUGS
Report bugs to <http://sf.net/bugs/?group_id=3331>.
COPYRIGHT
Copyright (C) 1995-2010 Charlie Zender
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
SEE ALSO
The full documentation for NCO is maintained as a Texinfo manual called the NCO User's Guide. Because NCO is mathematical in nature, the
documentation includes TeX-intensive portions not viewable on character-based displays. Hence the only complete and authoritative versions
of the NCO User's Guide are the PDF (recommended), DVI, and Postscript versions at <http://nco.sf.net/nco.pdf>,
<http://nco.sf.net/nco.dvi>, and <http://nco.sf.net/nco.ps>, respectively. HTML and XML versions are available at
<http://nco.sf.net/nco.html> and <http://nco.sf.net/nco.xml>, respectively.
If the info and NCO programs are properly installed at your site, the command
info nco
should give you access to the complete manual, except for the TeX-intensive portions.
HOMEPAGE
The NCO homepage at <http://nco.sf.net> contains more information.
NCAP2(1)
Check Out this Related Man Page
NCPDQ(1) General Commands Manual NCPDQ(1)NAME
ncpdq - netCDF Permute Dimensions Quickly, Pack Data Quietly...
SYNTAX
ncpdq [-3] [-4] [-6] [-A] [-a dim[,...]] [-C] [-c] [-D dbg] [-d dim,[ min][,[ max]]] [-F] [-h] [-L dfl_lvl] [-l path] [-M pck_map] [-O]
[-o output-file] [-P pck_plc] [-p path] [-R] [-r] [-t thr_nbr] [-v var[,...]] [-X box] [-x] input-file [ output-file ]
DESCRIPTION
ncpdq packs or re-shapes variables in input-file and stores them in output-file. Which variables to pack/unpack are determined by the
packing policy encoded in the pck_plc argument to the -P switch. Valid pck_plc options are all_new, all_xst, xst_new, and upk. The
numeric type of variable to pack or re-pack a variable to is determined by the packing map encoded in the pck_map argument to the -M
switch. Valid pck_map options are flt_byt, flt_sht, hgh_byt, hgh_sht, and nxt_lsr.
ncpdq re-shapes variables in input-file by re-ordering and/or reversing dimensions specified in the dimension list. The dimension list is
a comma separated list of dimension names, optionally prefixed by negative signs, that follow the -a switch. To re-order variables by a
subset of their dimensions, specify these dimensions in a comma-separated list following -a, e.g., -a lon,lat. To reverse a dimension,
prefix its name with a negative sign in the dimension list, e.g., -a -lat. Re-ordering and reversal may be performed simultaneously, e.g.,
-a lon,-lat,time,-lev.
Users may specify any permutation of dimensions, including permutations which change the record dimension identity. The record dimension
is re-ordered like any other dimension. The record dimension is always the most slowly varying dimension in a record variable. The speci-
fied re-ordering will fail if it requires creating more than one record dimension amongst all the output variables.
AUTHOR
NCO manual pages written by Charlie Zender and Brian Mays.
REPORTING BUGS
Report bugs to <http://sf.net/bugs/?group_id=3331>.
COPYRIGHT
Copyright (C) 1995-2010 Charlie Zender
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
SEE ALSO
The full documentation for NCO is maintained as a Texinfo manual called the NCO User's Guide. Because NCO is mathematical in nature, the
documentation includes TeX-intensive portions not viewable on character-based displays. Hence the only complete and authoritative versions
of the NCO User's Guide are the PDF (recommended), DVI, and Postscript versions at <http://nco.sf.net/nco.pdf>,
<http://nco.sf.net/nco.dvi>, and <http://nco.sf.net/nco.ps>, respectively. HTML and XML versions are available at
<http://nco.sf.net/nco.html> and <http://nco.sf.net/nco.xml>, respectively.
If the info and NCO programs are properly installed at your site, the command
info nco
should give you access to the complete manual, except for the TeX-intensive portions.
HOMEPAGE
The NCO homepage at <http://nco.sf.net> contains more information.
NCPDQ(1)