> Organization: ERL
> Keywords: 199408312007.AA13009
Hi Tom,
> Is it possible with the current C++ NetCDF interface to write record
> (Unlimited) variables? I know the ncrecput function does not exist, but
> the manual for the C interface says that it's not necessary (accomplish
> the same by repeated calls to ncvarput; in C++, put). I've tried this
> method and I can never get more than one record in a variable.
Writing record variables is supported with the current C++ netCDF interface.
The netcdf/c++/nctst.cc program that comes with the current distribution
shows how this is done. Briefly, you just need to declare the unlimited
dimension by *not* providing a size argument to NcFile::add_dim(), for
example:
NcDim* frtimed = nc.add_dim("frtime"); // unlimited dimension
then just declare record variables to use this dimension as their first
dimension, for example:
NcVar* P = nc.add_var("P", ncFloat, frtimed, latd, lond);
and write data to the variable.
// We could write all P data at once with P->put(P_data, P->edges()),
// but instead we write one record at a time, to show use of setcur().
long rec = 0; // start at zero-th
const long nrecs = 1; // # records to write
P->put(&P_data[0], nrecs, NLATS, NLONS); // write zero-th record
P->set_cur(++rec); // set to next record
P->put(&P_data[NLATS*NLONS], nrecs, NLATS, NLONS); // write next record
--
Russ Rew UCAR Unidata Program
russ@xxxxxxxxxxxxxxxx P.O. Box 3000
http://www.unidata.ucar.edu/ Boulder, CO 80307-3000
