hi there, I was checking the source of expr (find it attached) and saw this "copysign" function that I needed for a formula, but I can't get it to work/load.

I'm trying something like [expr copysign($f1)] and it's not happening. The expr manual page in http://yadegari.org/expr/expr.html tells about this function as well, here it is:

copysign()

1

copy sign of a number(added in version 0.4)

So it seems I'm supposedly doing the right thing... is it a bug? I'm on extended 0.42 and it says that it's expr version 0.4 when it loads.

cheers