Re: trouble with nc_put_vara_scar

• To: "Paul Wessel" <pwessel@xxxxxxxxxx>
• Subject: Re: trouble with nc_put_vara_scar
• From: Russ Rew <russ@xxxxxxxxxxxxxxxx>
• Date: Fri, 27 Jun 2003 16:18:37 -0600

Hi Paul,

> I am obviously missing a point here, but this is my problem: We have
> read/write routines that accept a float array and a nc_type.  The routines
> use a switch (nc_type) to copy w/truncation to an appropriate temp array of
> the correct type, and then call the appropriate nc_put_vara_<type> function.
> This works fine for all except nc_put_vara_scar which returns the error
> "Attempt to convert between text and numbers".  I am thinking of scar as
> 1-byte numbers from -127/+127 as opposed to the uchar version which is
> 1-byte numbers in 0-255 range.  What is my misunderstanding?

I'm not sure, because the appended small test program works here by
using nc_put_vara_schar to write signed 1-byte numbers into a float
array, as verified by using ncdump on the netCDF file it creates.

If this fails on your platform, please provide more details about your
compiler/machine and we'll see if we can reproduce the problem.

--Russ

#include <stdio.h>
#include <stdlib.h>
#include <netcdf.h>

void
check_err(const int stat, const int line, const char *file) {
    if (stat != NC_NOERR) {
           (void) fprintf(stderr, "line %d of %s: %s\n", line, file, 
                          nc_strerror(stat));
        exit(1);
    }
}

int
main() {        /* create test-schar.nc, testing nc_put_var_schar() */

   int  ncid;
   int n_dim;
   size_t n_len = 4;
   int a_id;
#  define RANK_a 1
   int a_dims[RANK_a];

   int stat = nc_create("test-schar.nc", NC_CLOBBER, &ncid);
   check_err(stat,__LINE__,__FILE__);
   stat = nc_def_dim(ncid, "n", n_len, &n_dim);
   check_err(stat,__LINE__,__FILE__);
   a_dims[0] = n_dim;
   stat = nc_def_var(ncid, "a", NC_FLOAT, RANK_a, a_dims, &a_id);
   check_err(stat,__LINE__,__FILE__);
   stat = nc_enddef (ncid);
   check_err(stat,__LINE__,__FILE__);

   {
    static signed char a[] = {-2, -1, 0, 1};
    stat = nc_put_var_schar(ncid, a_id, a);
    check_err(stat,__LINE__,__FILE__);
   }
   stat = nc_close(ncid);
   check_err(stat,__LINE__,__FILE__);
   return 0;
}

• References:
  • trouble with nc_put_vara_scar
    • From: Paul Wessel