| c06hac | nag_fft_multiple_sine Discrete sine transform |
| c06hbc | nag_fft_multiple_cosine Discrete cosine transform |
| c06hcc | nag_fft_multiple_qtr_sine Discrete quarter-wave sine transform |
| c06hdc | nag_fft_multiple_qtr_cosine Discrete quarter-wave cosine transform |