General - 9.1 English - PG109

1. There is no need to create and destroy state, as must be done with the C model; this is handled internally by the FFT MEX function.
2. The FFT MEX function performs extensive checking of its inputs. Any invalid input results in a message reporting the error and the function terminates.
3. The MEX function produces data in the same order as the input data. Hence, if input_data was provided in natural sample index order (0,1,2,3...), output_data samples are also in natural sample index order.