Formula Engine Suggestions?

[rabidhamster]

I'm currently designing the formula engine. At the moment it works on very simple maths expressions, but i wonder whether people would like to suggest things to add to it.
At the moment, i'm planning:

sin,cos,tan,arcsin etc
arctan2
power
sawtooth

and a few more i can't remember. if anyone wants to suggest stuff, feel free. Remember the engine also contains custom variables, FOR loops, proper IF and DO...WHILE statements.

[Chris]

[rabidhamster]

[Rovastar]

I will have to check my emails again for the complete list but much as I suggested before.

[rabidhamster]

Done. I think i included every one.

- Gordon