| imat_filt | Create an imat_filt object |
| imat_filt/get | Get filter attributes. |
| imat_filt/set | Set filter attributes. |
| imat_filt/length | Return number of criteria in filter |
| imat_filt/char | Convert function filter into character string |
| imat_filt/and | Generate a combined filter (z1&z2) |
| imat_filt/or | Generate a combined filter (z1|z2) |
| imat_filt/not | Logically negate a filter (~z) |
| imat_filt/criteria | Extract individual criteria from imat_filt |
| imat_filt/in_filter | Check which imat_fn elements satisfy a filter |
| imat_filt/uiselect | Build or edit filter using graphical interface |