TF1 parameter signs missing?


I have used TF1 to do curve fits to a large number of curves and then histogrammed those parameters.

I found that TF1 reversed the sign of the linear parameter for a large class of these curves.

What would cause this? Does TF1 not store the sign of the coefficient?


I am not sure I have understood your problem, you should elaborate more and possibly giving a concrete example.
However, to answer directly, The TF1 stores the signed coefficient values (parameters)