Determine whether array represents data as signed 32-bit integers
Logical 1 (true) if the array stores its data as signed 32-bit integers, and logical 0 (false) otherwise.
Use mxIsInt32 to determine whether the specified array represents its real and imaginary data as 32-bit signed integers.
In C, calling mxIsInt32 is equivalent to calling:
mxGetClassID(pm) == mxINT32_CLASS
In Fortran, calling mxIsInt32 is equivalent to calling:
mxGetClassName(pm) == 'int32'