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The function nc_rename_var changes the name of a netCDF variable in an open netCDF dataset. If the new name is longer than the old name, the netCDF dataset must be in define mode. You cannot rename a variable to have the name of any existing variable.
int nc_rename_var(int ncid, int varid, const char* name);
ncid NetCDF ID, from a previous call to nc_open or nc_create.
varid Variable ID.
name New name for the specified variable.
nc_rename_var returns the value NC_NOERR if no errors occurred. Otherwise, the returned status indicates an error. Possible causes of errors include:
The new name is in use as the name of another variable. The variable ID is invalid for the specified netCDF dataset. The specified netCDF ID does not refer to an open netCDF dataset.
Here is an example using nc_rename_var to rename the variable rh to rel_hum in an existing netCDF dataset named foo.nc:
#include <netcdf.h>
...
int status; /* error status */
int ncid; /* netCDF ID */
int rh_id; /* variable ID */
...
status = nc_open("foo.nc", NC_WRITE, &ncid);
if (status != NC_NOERR) handle_error(status);
...
status = nc_redef(ncid); /* put in define mode to rename variable */
if (status != NC_NOERR) handle_error(status);
status = nc_inq_varid (ncid, "rh", &rh_id);
if (status != NC_NOERR) handle_error(status);
status = nc_rename_var (ncid, rh_id, "rel_hum");
if (status != NC_NOERR) handle_error(status);
status = nc_enddef(ncid); /* leave define mode */
if (status != NC_NOERR) handle_error(status);
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