Determine whether a property list has a fill value defined
H5Pfill_value_defined(h5plist)Object of class H5IdComponent representing a dataset creation property list.
TRUE if the fill value is defined, FALSE if not. Will return
NULL if there is a problem determining the status of the fill value.
Note that the return value for this function is slightly different from the C version. The C API provides three return types and can, in the case that a fill value is defined, differentiate whether the value is the HDF5 library default or has been set by the application.