ibotty <me / ibotty.net> wrote:
> before i spent to many words describing something so simple:
> 
> say, i have:
> a = [1,2,3] and b = [4,5,6]
> and i want to get another array, with c[ix] = a[ix] * b[ix].
> (i want to get c = [4,10,18])
> 
> is there a builtin function in array.rb (that i have missed).

Not quite, but for parallel traversing made easier

a.zip(b).map {|i, j| i*j}

martin