Can i create a complex sparse matrix using 'SPRSIN' function ? This function, in the oline help, was described : input argument : An n by n array of any type except string or complex. But the result (such as : ) >Result = SPRSIN(complex_array) Result.sa is NOT complex formation only the real part of input complex array with Result.aij is exact. Have any way to overcome this question ? THx, a lot.