The replies are providing an interesting comparison of packages for
manipulating netCDF files.
Here is my solution using (and shameless plug for) NAP (a.k.a. tcl-nap),
whose home is
http://tcl-nap.sourceforge.net
I wrote the following shell script named 'change_nc_value':
$ cat change_nc_value
#!/bin/sh
tclsh << END
nap "in = [nap_get netcdf $1 $2]"
[nap "in == $3 ? $4 : in"] netcdf $1 $2
END
I then tested it as follows:
$ ncdump G.nc
netcdf G {
dimensions:
d = 8 ;
variables:
float X(d) ;
data:
X = 27, 32.5, 32, 30.1, 29, 40, 32, 45 ;
}
$ change_nc_value G.nc X 32 45
$ ncdump G.nc
netcdf G {
dimensions:
d = 8 ;
variables:
float X(d) ;
data:
X = 27, 32.5, 45, 30.1, 29, 40, 45, 45 ;
}
Harvey Davies, CSIRO Marine and Atmospheric Research,
Private Bag No. 1, Aspendale 3195
E-mail: harvey.davies@xxxxxxxx
Office: 03 9239 4556
Mobile: 04 2241 7563
> -----Original Message-----
> From: owner-ncdigest@xxxxxxxxxxxxxxxx [mailto:owner-
> ncdigest@xxxxxxxxxxxxxxxx]
> Sent: Saturday, 12 November 2005 15:25
> To: ncdigest@xxxxxxxxxxxxxxxx
> Subject: ncdigest V1 #922
>
>
> ncdigest Friday, November 11 2005 Volume 01 :
Number
> 922
>
>
>
> Today's Topics:
> Manipulating netCDF files
> Re: Manipulating netCDF files
> Re: Manipulating netCDF files
> Re: Manipulating netCDF files
> Re: Manipulating netCDF files
> RE: Manipulating netCDF files
>
>
----------------------------------------------------------------------
>
> Date: Fri, 11 Nov 2005 07:32:16 -0600
> From: "Waylon.Collins" <Waylon.Collins@xxxxxxxx>
> Subject: Manipulating netCDF files
>
> Dear group members,
>
> After reviewed the Unidata list of software that manipulates netCDF
> files, I have yet to find one that can perform the following task --
I
> need command-line software (that can run in a Redhat Enterprise
Linux
> environment) that will allow me to replace data values, associated
with
> a particular variable, with values that I can specify. It needs to
allow
> for a logical operation. For example, the software needs to be able
to
> perform the following -- "Any datum of variable X, within netCDF
file
> with filename F.nc, that equals 32, change it to the value 45. Thus,
the
> original file F.nc is now altered, or the altered file is now named
> G.nc". Any help will be greatly appreciated.
>
> Sincerely,
>
> Waylon
>
> - --
>
**********************************************************************
> * Waylon G. Collins Voice: (361)289-0959
*
> * NOAA/National Weather Service E-Mail: Waylon.Collins@xxxxxxxx
*
> * 300 Pinson Drive
*
> * Corpus Christi, TX 78406
*
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>
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