> #declare Number = function(MyNumber)
> {
>  #declare MyAngle = rand(NySeed)*MyNumber;
>  #declare MyPositive = rand(MySeed)*1.0;
>  #if(MyPositive<0.5)
>   MyAngle*(+1) // no #declare and no ;
>  #else
>   MyAngle*(-1) // no #declare and no ;
>  #end
> }
>
> rotate < 0.0, Number(1.2), 0.0 >

What you're doing is not a function, but a macro.

A function operates like this:

#declare PosOrNeg = function (N) {select(N, -1, 1)};
#declare Seed = seed(123);

#for (Num, 1, 10)
 #declare N = rand (Seed)-0.5;
 #debug concat( " Result = ", str(PosOrNeg(N), 3, 1), "\n")
#end

You can then incorporate that into a calculation to give you an angle multiplied
by 1 or -1.

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