Input

• a - S3L array handle for a parallel real array. For S3L_rc_fft, the contents of a are real values. For S3L_cr_fft, they are the packed representation of a complex array. Upon successful completion, both routines overwrite a with the results of the forward or inverse FFT. See the Output section for a discussion of the use of a for output.

• setup_id - Scalar integer variable. Use the value returned by the S3L_rc_fft_setup call for this argument.