Somewhere I've seen how to plot a family of functions but I've forgotten the exact notation. The following is definitely not correct: plot2d([block([n], for n:1 thru 3 do (f(x):=sin(n*x)),f(x))],[x,0,2*%Pi]); but I think you can guess what I intend to do. What is the correct notation? Yours, Poul Riis