Asdcarl.145 net.general utzoo!decvax!duke!chico!harpo!mhtsa!ihnss!ucbvax!ucsfcgl!sdcarl!dgl Mon Jan 25 16:57:18 1982 Query on Cubic Spline function I am looking for a cubic spline function which will allow non-monotonic values of x. I am aware of spline(1) in the UPM, but it requires x to be monotonic. My application is to draw trajectories in two dimensions that can (among other things) return to their point of origin.