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Re: 950605: ncvarput

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  • Subject: Re: 950605: ncvarput
  • Date: Tue, 06 Jun 1995 05:59:36 -0600
>From: Maureen Cribb <address@hidden>
>Keywords: 199506051445.AA05554 ncvarput

Hi Maureen,

> While running the attached C program, the following error message
> appears at the point where a hyperslab of values is being read into
> the netCDF variable,T :
>                ncvarput: Invalid edge length 180
>  
> It would appear that I'm incorrectly defining the edge lengths ...
> can you suggest what I'm doing wrong?

Yes, it looks like you need to start your indexing at 0 rather than 1, since
you are using C rather than Fortran.  Specifically, where you have:

>    start[1]=0;  
>    start[2]=0;   
>    start[3]=k;   
> 
> /* put all 360x180 values at one particular level */
>    count[1]=360; 
>    count[2]=180;
>    count[3]=1;
>       
>    ncvarput(ncid,t_id,start,count,(void*) T);

you want instead:

     start[0]=0;  
     start[1]=0;   
     start[2]=k;   
  
  /* put all 360x180 values at one particular level */
     count[0]=360; 
     count[1]=180;
     count[2]=1;

A few more suggestions:

> /* to compile:
>  CC -o insee insee.c +w -L/opt/netcdf/lib -lnetcdf 
> -I/opt/netcdf/include/netcdf.inc
> */

I think the include option should be 

    -I/opt/netcdf/include

since it should name a directory, not a file.

> #include <stdio.h>
> #include <stdlib.h>
> #include "/opt/netcdf/include/netcdf.h"

The latter include statement should just be

  #include <netcdf.h>

given the correct include option on the compile line.

> void main(void);
> 
> void main(void){
> 
> FILE *the_data;
> int lon_id,lat_id,z_id,t_id,ncid;
> int lat_inc,i,j,k,m,z[2];
> long int start[3],count[3];
> float lg[360],lt[180],T[360][180];
> 
> static long lg_start[]={0};
> static long lg_count[]={360};
> static long lt_start[]={0};
> static long lt_count[]={180};
> static long z_start[]={0};
> static long z_count[]={2};
> 
> the_data=fopen("test.obj","r");
> ncid=ncopen("test.nc",NC_WRITE);
> 
> /* get variable id #s */
> lon_id=ncvarid(ncid,"lon");
> lat_id=ncvarid(ncid,"lat");
> z_id=ncvarid(ncid,"z");
> t_id=ncvarid(ncid,"T");
> 
> /* fill lat, lon, z arrays */
> for(i=0; i<360; i++)
>     lg[i]=i+0.5;
> 
> ncvarput(ncid,lon_id,lg_start,lg_count,(void*) lg);
> 
> for(i=0; i<180; i++) 
>     lt[i]=i-89.5;
> 
> ncvarput(ncid,lat_id,lt_start,lt_count,(void*) lt);
> 
> z[1]=0;
> z[2]=-10;

Again, the indexing should start at 0.  z[2] does not exist.

______________________________________________________________________________

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