[PD] expr "copysign" function doesn't seem to work

[Alexandre Torres Porres]

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
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