> The replies are providing an interesting comparison of packages for
> manipulating netCDF files.
I would add an example using Ruby, which is an object-oriented
language like Python.
% cat edit_nc.rb
require 'numru/netcdf'
include NumRu # Or use NumRu::NetCDF instead of NetCDF below
file = NetCDF.open('G.nc','a') # 'a' (append) or 'r+' like fopen in C
x = file.var('X')
val = x.get
val[ val.eq(32.0) ] = 45.0
x.put(val)
file.close
Here, I use the same netcdf file as a privious reporter used, but
the program works regardress the rank (# of dimensions) of the
varibale.
% ncdump G.nc
netcdf G {
dimensions:
d = 8 ;
variables:
float X(d) ;
data:
X = 27 , 32.5 , 32 , 30.1 , 29 , 40 , 32 , 45 ;
}
% ruby edit_nc.rb
% ncdump G.nc
netcdf G {
dimensions:
d = 8 ;
variables:
float X(d) ;
data:
X = 27 , 32.5 , 45 , 30.1 , 29 , 40 , 45 , 45 ;
}
--
Takeshi Horinouchi (Kyoto Univ.)
>
> 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
> *
> > * USA
> *
> >
> **********************************************************************
