Peter Kolbus" writes: > I have never seen a double equality (graphed, or at all!)... but you may > try parametric mode with > xt=f(y) > yt=t This will definitely plot the graph of x = f(y), allowing you to trace, etc. But I believe that needs to be xt = f(t) ! RWW Taylor National Technical Institute for the Deaf Rochester Institute of Technology Rochester NY 14623 >> The plural of mongoose begins with p. <<