Each member of the family of functions nc_put_vars_ type writes a subsampled (strided) array section of values into a netCDF variable of an open netCDF dataset. The subsampled array section is specified by giving a corner, a vector of counts, and a stride vector. The netCDF dataset must be in data mode.
The functions for types ubyte, ushort, uint, longlong, ulonglong, and string are only available for netCDF-4/HDF5 files.
The nc_put_vars() function will write a variable of any type, including user defined type. For this function, the type of the data in memory must match the type of the variable - no data conversion is done.
int nc_put_vars_text (int ncid, int varid, const size_t start[], const size_t count[], const ptrdiff_t stride[], const char *tp); int nc_put_vars_uchar (int ncid, int varid, const size_t start[], const size_t count[], const ptrdiff_t stride[], const unsigned char *up); int nc_put_vars_schar (int ncid, int varid, const size_t start[], const size_t count[], const ptrdiff_t stride[], const signed char *cp); int nc_put_vars_short (int ncid, int varid, const size_t start[], const size_t count[], const ptrdiff_t stride[], const short *sp); int nc_put_vars_int (int ncid, int varid, const size_t start[], const size_t count[], const ptrdiff_t stride[], const int *ip); int nc_put_vars_long (int ncid, int varid, const size_t start[], const size_t count[], const ptrdiff_t stride[], const long *lp); int nc_put_vars_float (int ncid, int varid, const size_t start[], const size_t count[], const ptrdiff_t stride[], const float *fp); int nc_put_vars_double(int ncid, int varid, const size_t start[], const size_t count[], const ptrdiff_t stride[], const double *dp); int nc_put_vars_ubyte (int ncid, int varid, const size_t *startp, const size_t *countp, const ptrdiff_t *stridep, const unsigned char *op); int nc_put_vars_ushort(int ncid, int varid, const size_t *startp, const size_t *countp, const ptrdiff_t *stridep, const unsigned short *op); int nc_put_vars_uint (int ncid, int varid, const size_t *startp, const size_t *countp, const ptrdiff_t *stridep, const unsigned int *op); int nc_put_vars_longlong (int ncid, int varid, const size_t *startp, const size_t *countp, const ptrdiff_t *stridep, const long long *op); int nc_put_vars_ulonglong(int ncid, int varid, const size_t *startp, const size_t *countp, const ptrdiff_t *stridep, const unsigned long long *op); int nc_put_vars_string(int ncid, int varid, const size_t *startp, const size_t *countp, const ptrdiff_t *stridep, const char **op); int nc_put_vars (int ncid, int varid, const size_t *startp, const size_t *countp, const ptrdiff_t *stridep, const void *op);
ncid
varid
start
count
Note: setting any element of the count array to zero causes the
function to exit without error, and without doing anything.
stride
tp
up
cp
sp
ip
lp
fp
dp
Here is an example of using nc_put_vars_float to write – from an internal array – every other point of a netCDF variable named rh which is described by the C declaration float rh[4][6] (note the size of the dimensions):
#include <netcdf.h> ... #define NDIM 2 /* rank of netCDF variable */ int ncid; /* netCDF ID */ int status; /* error status */ int rhid; /* variable ID */ static size_t start[NDIM] /* netCDF variable start point: */ = {0, 0}; /* first element */ static size_t count[NDIM] /* size of internal array: entire */ = {2, 3}; /* (subsampled) netCDF variable */ static ptrdiff_t stride[NDIM] /* variable subsampling intervals: */ = {2, 2}; /* access every other netCDF element */ float rh[2][3]; /* note subsampled sizes for */ /* netCDF variable dimensions */ ... status = nc_open("foo.nc", NC_WRITE, &ncid); if (status != NC_NOERR) handle_error(status); ... status = nc_inq_varid(ncid, "rh", &rhid); if (status != NC_NOERR) handle_error(status); ... status = nc_put_vars_float(ncid, rhid, start, count, stride, rh); if (status != NC_NOERR) handle_error(status);