Dear the experts of RooFit,
when I try to fit (external) data histograms using RooFit, sometimes I got the following warning messages, which looks like indicating some kind of numerical issue:
[#0] WARNING:Integration – RooIntegrator1D::integral: integral of bkg over range (0.1396,0.1652) did not converge after 20 steps
[1] h = 1 , s = inf
[2] h = 0.25 , s = inf
[3] h = 0.0625 , s = inf
[4] h = 0.015625 , s = inf
[5] h = 0.00390625 , s = inf
[6] h = 0.000976562 , s = inf
[7] h = 0.000244141 , s = inf
[8] h = 6.10352e-05 , s = inf
[9] h = 1.52588e-05 , s = inf
[10] h = 3.8147e-06 , s = inf
[11] h = 9.53674e-07 , s = inf
[12] h = 2.38419e-07 , s = inf
[13] h = 5.96046e-08 , s = inf
[14] h = 1.49012e-08 , s = inf
[15] h = 3.72529e-09 , s = inf
[16] h = 9.31323e-10 , s = inf
[17] h = 2.32831e-10 , s = inf
[18] h = 5.82077e-11 , s = inf
[19] h = 1.45519e-11 , s = inf
[20] h = 3.63798e-12 , s = inf
, which keeps over again and again and does not give me any result even for several hours.
I wonder what ‘h’ and ‘s’ here mean exactly and what could be possible reason for ‘inf’ results with ‘s’.
Thanks a lot for your help!