> > But by the tenets of Linear Algebra, spanning vectors, etc., there has > to be. You still have two axes, that's not enough to describe a > 3-dimensional space. Yup. I see that now. Bummer. No matter how you twist, there's always a vector that's 90 degrees out from both of them. I can email a jpg that shows this, if anyone's interested. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist