[netCDF #WHV-523215]: add variable

Hi Fereshte,

> i am newbie with netcdf files manipulate. my aim is adding  3  variables(
> which all of them are in 3 different netcdf files) with fourth netcdf file.
> all of 4 files have same time step, longitude and latitude. but i cant fine
> any way to do that. is it  possible to do that with MATLAB? if it is, would
> you please tell me how. or if there is other way please guide me. i prefer
> to say that i have installed NCL too.

I;m confident it's possible to do what you want with MATLAB, but I can't tell
you exactly how, as we don't have a platform on which MATLAB is available, and
we didn't develop or maintain the MATLAB netCDF interface.

However, I can summarize how I would do it in C, and a similar approach should
work for MATLAB:

  Call the variables var1, var2, var3, and var4, in files file1.nc, file2.nc,
  file3.nc, and file4.nc, respectively.  (Use a copy of file4.nc, so that you 
  don't clobber the file4 data in case of a mistake.)

  Open file4.nc for writing (involves a call to nc_open(...) ).  Put it in
  "define mode" with a call to nc_def(...).

  In file4.nc, define var1, var2, and var3, using existing dimensions already 
  defined in file4.nc.  This involves 3 calls to nc_create_var(...).  
  Leave file4.nc open, but exit define mode, with a call to nc_enddef(...).

  Open file1.nc for reading, using nc_open(...).  Read the data from var1 
  into an array in memory, using nc_get_var_double(...) if it all fits in
  memory at once, or in slices using or nc_get_vara_double(...) otherwise.
  After you read each variable or slice into an array, write it to out to
  the corresponding variable in file4.nc, using nc_put_var_double(...) or 
  nc_put_vara_double(...).  If the data is not of type double, use the 
  appropriate type.  Close file1.nc.

  Now repeat the last step for var2 from file2.nc and var3 from file3.nc.
  
  Close file4.nc

--Russ

Russ Rew                                         UCAR Unidata Program
address@hidden                      http://www.unidata.ucar.edu



Ticket Details
===================
Ticket ID: WHV-523215
Department: Support netCDF
Priority: Normal
Status: Closed