Hi, I convert a ntuple file to root file. I analysis it via root like that: ... TFile *f = new TFile("myroot.root"); Three *tree = h1; //This is Three key in root file. TCut vtxcut("sqrt(Ksvx*Ksvx+Ksvy*Ksvy+Ksvz*Ksvz)>0.03"); TCut richcut("Ksrhphs1>3&&Ksrhphs2>3&&Ksrh1==1&&Ksrh2==1\ &&Ksrhpil1<Ksrhkl1&&Ksrhpil2<Ksrhkl2"); tree->Draw("Ksmass",vtxcut&&richcut); *** Break *** floating point exception But if tree->Draw("Ksmass",vtxcut); or tree->Draw("Ksmass",richcut); it is ok! It seems strange. Thank you Gong Datao
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