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Re: 980316: netcdf-perl-1.2

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  • Subject: Re: 980316: netcdf-perl-1.2
  • Date: Mon, 16 Mar 1998 14:31:01 -0700
Dan,

> To: address@hidden
> From: address@hidden (Dan Schmitt)
> Subject: netcdf-perl-1.2
> Organization: Texas A&M University/Department of Rangeland Ecology and 
> Management
> Keywords: 199803132329.QAA15292

In the above message, you wrote:

>       I just gave you the report on the sucsessful install
> on the RedHat 4.2 alpha (gcc 2.7.2.1 and netcdf 3.3.1).  Well,
> I have some questions now.
> 
>       $ncid = NetCDF::open("foo.nc",WRITE);
> 
> opens the file for read only, but
> 
>       $ncid = NetCDF::open("foo.nc",1);
> 
> does what I want.  It looks like the constants don't get
> pushed to the ncopen statement correctly (at least WRITE)
> and it's not tested in test.pl.

Does the following work?

    $ncid = NetCDF::open("foo.nc",NetCDF::WRITE);

> 
> With a netcdf file that looks like:
> 
> dimensions:
>         record = UNLIMITED ; // (0 currently)
>         wdescription = 512 ;
> variables:
>         char name(record, wdescription) ;
>                 name:long_name = "Simulation Name" ;
>         char soil(record, wdescription) ;
>                 soil:long_name = "Soil Coverage" ;
>         char plant(record, wdescription) ;
>                 plant:long_name = "Plant Coverage" ;
>         char grazer(record, wdescription) ;
>                 grazer:long_name = "Grazer Coverage" ;
>         char weather(record, wdescription) ;
>                 weather:long_name = "Weather Coverage" ;
> 
> from the ncdump world, I can't get values into the individual
> variables.
> 
>       $fname = NetCDF::varid($ncid,"name");
>       NetCDF::varput($ncid,$fname,(0,0),(1,1),"a");
> 
> Won't "do the right thing" because the varput does a dim_inquire
> to check sizes and doesn't like the fact that the record dim has
> a current length of zero and my total data content is greater than
> that (there used to be a simlar bug in the C++ interface), and
> recput wants me to set all 5 of the variables (which I guess
> I could do, but is pretty unweildy for me.)

Does the following work?

    NetCDF::varput($ncid,$fname,\(0,0),\(1,1),\"a");

As I recall, "(0,0)" will cause two *arguments* to be passed to
"NetCDF::varput" rather than a single reference to an array of two
scalar values.

> 
> My XSUB programming is pretty weak, but I'm open for suggestions
> from you guys on what I should try.  Monday I'll hit the XSUB stuff
> and see if I can relax the varput requirements, or look into the
> varput1 stuff.
> 
> Thanks,
> 
>       Dan S.
> 
> Dan Schmitt                          http://ranch.tamu.edu/~dmschmit
> Systems Analyst       
> 
> Ranching Systems Group                                Phone # (409) 845-7333
> Department of Rangeland Ecology and Management        Fax   # (409) 846-6430
> Texas A&M University                          Home  # (409) 846-3914
> College Station Texas 77843-2126              ICBM: 30.67 N, 96.37 W
> 
> When life presents you with two impossible tasks, always pick the really BIG
> one.  I mean, if you're determined to do the impossible anyway, why aim low?
>       -Jaffo

--------
Steve Emmerson   <http://www.unidata.ucar.edu>