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Previous: Inquiry Functions, Up: Useful Functions
Usually users are interested in reading or writing subsets of variables in a netCDF data file. The netCDF APIs provide a variety of functions for this purpose.
In the simplest case, you will use the same type for both file and in-memory storage, but in some cases you may wish to use different types. For example, you might have a netCDF file that contains integer data, and you wish to read it into floating-point storage, converting the data as it is read. The same sort of type conversion can be done when writing the data.
To convert to a type while reading data, use the appropriate nc_get_vara_<TYPE> or NF_GET_VARA_<TYPE> function. For example, the C function nc_get_vara_float(), and the Fortran function NF_GET_VARA_REAL will read netCDF data of any numeric type into a floating-point array, automatically converting each element to the desired type.
To convert from a type while writing data, use the appropriate nc_put_vara_<TYPE> or NF_PUT_VARA_<TYPE> function. For example, the C function nc_put_vara_float(), and the Fortran function NC_PUT_VARA_REAL will write floating-point data into netCDF arrays, automatically converting each element of the array to the type of the netCDF variable.
The <TYPE> in the function name refers to the type of the in-memory data, in both cases. They type of the file data is determined when the netCDF variable is defined.
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