Multiplying two polynomial functions

I have two polN functions which I multiply in a third function:

f11 = TF1('f11','pol1',0,10)

f21 = TF1('f21','pol0',0,10)

f31 = TF1('f31','f11*f21',0,10)

However, when plotting, f31 is the same as f11. Why is that?

When I create the polN function by hand ([0]+x*[1] etc.) then multiplication
works as expected.

Full example attached. (1.1 KB)

Search for “polN” In the TF1 class description. :stuck_out_tongue: