Dear Rooters! I have fitted a TH2F with a TF2 function (14 parameters). Now I want to calculate the value in a bin(cell) (btw, why are there functions TF2::SetCellContent(),TF2::SetBinContent(), which absolutely do the same?) with resulting error from the fit, including covariances. I found a function TF1::Eval(x,y,z,t) which gives a value, but I could not find something connected to errors. (btw, what is "t") In the digest from Wed Dec 04 2002 - 22:32:43 MET I found a way to get the cov matrix. via TMinuit::mnemat(..), thus with the knowledge of the Hesse matrix at this cell one should be able to compute an error (unoftunately neither TMinuit::mnhess() nor TMinut::mnhes1() do not have any return value) ... Does anybody have an example how to do this? Thanks a lot, Michael
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