I am trying to fit a 2D histogram with the predefined xygaus function. It works without a problem if I use the fit window and get the desired results. However, I am trying to do this in a macro. Whenever I try to fit the histogram with:
It returns Unknown function: xygaus
How is it that this function is undefined when it says it is predefined in the root fit window? And How do I fit the 2D histogram with a xygaus function? This seems like a simple question, but I have been searching for an answer for about a day now.