Problem extracting derivative of Spline fit in JSL
HI everyone, I am having a curious problem I cannot figure out. I have 2 variables (say Y and X) for which I want to extract the derivative of a smooth function linking the two. I can do it "manually" if my two variable are in a table. I simply fit a smooth spline, save the predicted formula, go in the formula editor and use the derivative option in the editor itself. Now I want to do the same but...