<P>>> help tube</P>
<P> TUBE Generating function for Edward's parametric curves.<BR> tube(xy,ab,rtr,pq)) takes the following arguments:<BR> <BR> xy = string name of function [xt,yt] = xy(t)<BR> defining parametric curve to be revolved<BR> ab = [a b] = interval of defn of parametric curve<BR> rtr = [radius twist revs] for revolution of curve<BR> pq = [p q] = numbers of t- and u-subintervals<BR> box = [x1 x2 y1 y2 z1 z2] for viewing tube<BR></P>