Help with masktools + RPN?

[Sagekilla]

I'm trying to learn masktools but I can't figure out for the life of me how to do the reverse polish notation.

What I wanna figure out is how I would do something like: (x < 20) ? x + 20 : x

Except, I went and tried to read masktools documentation (and look up RPN online) but I haven't found any help regarding this at all.. Can anyone instruct how I would properly do ternary operators or boolean operators? :)

[thetoof]

A great tool to learn how it works is to write your infix expression in a mt_polish call.
subtitle(string(mt_polish("(x < 20) ? x + 20 : x")))
Result: x 20 < x 20 + x ?

[Fizick]

so, why not revert all masktools polish style to usual ternary? (may be option "polish=false")
It is a task for MaskTools 2.1 development ;)

[Sagekilla]

Oho, you'll be implementing the standard infix notation soon? Great to hear :) I like the idea of RPN, but it's sort of.. unusable for me right now.

[Fizick]

No, me not :)

[Adub]

Talk to Manao about it.

[IanB]

Oh geezzzz, just use the MT_POLISH call in the other MT_* functions. Write a wrapper function if it helps.

[pbristow]

Another quicky on the RPN in masktools: Is there an operator to duplicate the top stack entry? I couldn't find one, but I'm hoping I've just overlooked the obvious.

For example, to calculate the square of (x - y), do I have to use "x y - x y - *", or is there an option of "x y - dup *"?

(I suppose there's always "x y - 2 ^", but that goes against the grain somehow... :) )