2-D, sparse, logical array
Pointer to the created mxArray, if successful. If unsuccessful in a standalone (non-MEX-file) application, returns NULL in C (0 in Fortran). If unsuccessful in a MEX-file, the MEX-file terminates and returns control to the MATLAB® prompt. The function is unsuccessful when there is not enough free heap space to create the mxArray.
Use mxCreateSparseLogicalMatrix to create an m-by-n mxArray of mxLogical elements. mxCreateSparseLogicalMatrix initializes each element in the array to logical 0.
Call mxDestroyArray when you finish using the mxArray. mxDestroyArray deallocates the mxArray and its elements.