Array header information only
Pointer to a newly allocated mxArray structure representing header information for the mxArray named by name from the MAT-file pointed to by mfp.
matGetVariableInfo returns NULL in C (0 in Fortran) if the attempt to return header information for the mxArray named by name fails.
matGetVariableInfo loads only the array header information, including everything except pr, pi, ir, and jc. It recursively creates the cells and structures through their leaf elements, but does not include pr, pi, ir, and jc.
If pr, pi, ir, and jc are nonzero values when loaded with matGetVariable, matGetVariableInfo sets them to -1 instead. These headers are for informational use only. Never pass this data back to the MATLAB® workspace or save it to MAT-files.
Use mxDestroyArray to destroy the mxArray created by this routine when you are finished with it.