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75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
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/* This example program is part of Unidata's netCDF library for
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scientific data access.
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How about a short, but meaningful, netCDF program?
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Ed Hartnett, 6/19/4
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$Id: simple.c,v 1.1 2004/07/26 14:04:42 ed Exp $
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*/
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#include <netcdf.h>
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#include <stdio.h>
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#include <string.h>
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/* This macro handles errors by outputting a message to stdout and
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then exiting. */
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#define NC_EXAMPLE_ERROR 2 /* This is the exit code for failure. */
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#define BAIL(e) do { \
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printf("Bailing out in file %s, line %d, error:%s.\n", \
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__FILE__, __LINE__, nc_strerror(e)); \
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return NC_EXAMPLE_ERROR; \
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} while (0)
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#define NUMDIMS 2
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#define NUMVARS 1
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#define CELSIUS "celsius"
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#define LAT_LEN 3
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#define LON_LEN 2
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int
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main()
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{
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int ncid, temp_varid, dimids[NUMDIMS];
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float temp[LAT_LEN][LON_LEN], *fp;
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int i, res;
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/* Create a bunch of phoney data so we have something to write in
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the example file. */
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for (fp=(float *)temp, i=0; i<LAT_LEN*LON_LEN; i++)
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*fp++ = 10. + i/10.;
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/* Create the netCDF file. */
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if ((res = nc_create("short.nc", NC_CLOBBER, &ncid)))
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BAIL(res);
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/* Define dimensions. */
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if ((res = nc_def_dim(ncid, "latitude", LAT_LEN, dimids)))
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BAIL(res);
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if ((res = nc_def_dim(ncid, "longitude", LON_LEN, &dimids[1])))
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BAIL(res);
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/* Define the variable. */
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if ((res = nc_def_var(ncid, "sfc_temp", NC_FLOAT, NUMDIMS,
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dimids, &temp_varid)))
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BAIL(res);
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/* We'll store the units. */
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if ((res = nc_put_att_text(ncid, temp_varid, "units",
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strlen(CELSIUS), CELSIUS)))
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BAIL(res);
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/* We're finished defining metadata. */
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if ((res = nc_enddef(ncid)))
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BAIL(res);
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if ((res = nc_put_var_float(ncid, temp_varid, (float *)temp)))
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BAIL(res);
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/* We're done! */
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if ((res = nc_close(ncid)))
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BAIL(res);
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return 0;
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}
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