Determine whether data is complex
Logical 1 (true) if pm is a numeric array containing complex data, and logical 0 (false) otherwise. If pm points to a cell array or a structure array, mxIsComplex returns false.
Use mxIsComplex to determine whether an imaginary part is allocated for an mxArray. The imaginary pointer pi is NULL in C (0 in Fortran) if an mxArray is purely real and does not have any imaginary data. If an mxArray is complex, pi points to an array of numbers.
See the following examples in matlabroot/extern/examples/mx.
See the following examples in matlabroot/extern/examples/refbook.
See the following examples in matlabroot/extern/examples/mex.