while the others are discussing VB...

good work!
impressed... I was to slack to do something like this, so i just used a graphing calculator or "maple" (does anyone hate that program as much as me? I'm sure that no programmers programmed that tool... it was mathematicians ... they're at verson 11, and scrolling still doesn't work ^^)

anyways, neat tool. I can't imagine at all how you transform the string into a function that can be calculated for multiple points...
well done

MIcha