Hi Rooters, Thanx to Rene for his latest answers :) There is a few more question... I wanted to use TPRofile2D to represent the average of a value depending on two differents parameters (until now, I fill 2 TH2F and Divide). But, this value has to be zeroed at some point (there is some noise offset to correct from). It seems to me that TProfile2D::Add, with a constant function is the way to go... But it was not implemented. Could it be implemented this way ?: (significativ extract -unchecked- for the loop, the rest is a mix of TH1::Add(TH1*,Double_t) and TProfile::Add(TProfile*,Double_t)) <<<< cu = c1*f1->EvalPar(xx); fArray[bin] += cu*fBinEntries.fArray[bin]; >>>> For me, errors doesnt have to change in such an operation, that would only shift the mean. I tried to derivate a 'TProfile2DY' from TProfile2D with only this method changed, but it seems that I also have to write a lot of things I really dont know about, because at link I got: /home/patois/work/root/analyse_tree/TProfile2DY.cpp:24: undefined reference to `TProfile2DY::TAttLine virtual table' [snip a few other similar lines with AttFill and such] The above line is when I dont try to generate a dictionnary for the class, if I do, and link with it: TProfile2DY.o: In function `TProfile2DY::Dictionary(void)': /home/patois/work/root/analyse_tree/TProfile2DY.cpp:21: undefined reference to `TProfile2DY::DeclFileLine(void)' And a lot more errors... Well the easiest for me would be that TProfile2D::Add(TF1..) would be implemented in ROOT :) Yannick -- _/ Yannick Patois _________________ Address (home) __________________ | irc(undernet): Garp on #france25+ | La Villa des Sciences | | email : patois@calvix.org | 12, avenue de Cambridge | | http://garp.feelingsurfer.net/ | 14200 Herouville-Saint-Clair | | Tel/Fax-home:+33 (0)2 31 94 50 32 | FRANCE | | Petit Portail en Bois, Modeste et Génial : http://www.rezo.net/ |
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