funcs is a documentation utility which allows you to
browse the functions available in the expression language used
when specifying some expressions to Yafit, described in Section 6.
Invoking the command causes a window to pop up on the display with two parts. The left hand panel contains a tree-like representation of the functions available - the top level shows the classes (categories) into which the functions are divided, and if you open these up (by double clicking on them) each contains a list of functions and constants in that class. If you click on any of these classes or their constituent functions or constants, a full descritption of what they are and how to use them will appear in the right hand panel.
Usage: funcs [-help] [-debug]