| C06HAF | Discrete sine transform |
| C06HBF | Discrete cosine transform |
| C06HCF | Discrete quarter-wave sine transform |
| C06HDF | Discrete quarter-wave cosine transform |
| C06RAF | Discrete sine transform (easy-to-use) |
| C06RBF | Discrete cosine transform (easy-to-use) |
| C06RCF | Discrete quarter-wave sine transform (easy-to-use) |
| C06RDF | Discrete quarter-wave cosine transform (easy-to-use) |