Here you can find root's instructions with in comment their results or informations. Coul you help me ? TFile f("prehinv.root"); // prehinv.root is root file obtained from h2root TH1F h1f("h1f","Higgs mass",100,0,200); // an histogram h10.Draw("Elep[0]"); // Gives a Funny plot //7861 entries, Mean: 0, Rms: 0 h10.Draw("Elep"); // right plot //16719 entries mean: 37.35 , Rms: 28.23 //is sum of Elep vector ? h10.Draw("Elep[0]"); // right plot !!! Why now ? //7861 entries, Mean: 46.05, Rms: 33.9 Char_t* Zmass2 = "2*Elep[0]*Elep[1]*(1-(sin(Tlep[0])*cos(Plep[0])*sin(Tlep[1])*cos(Plep[1])+sin(Tlep[0])*sin(Plep[0])*sin(Tlep[1])*sin(Plep[1])+cos(Tlep[0])*cos(Tlep[1])))"; Char_t Hmass[300]; sprintf(Hmass,"sqrt(Encm*Encm+%s-2.*Encm*(Elep[0]+Elep[1]))>>%s",Zmass2,"h1f") h10.Draw(Hmass); //This error message is done: //*ERROR 26 : // Unknown name : "Elep[0]" //Why ? //and now h10.Draw("Elep[0]"); //gives the same error ! //*ERROR 26 : // Unknown name : "Elep[0]" Here you can find informations about Elep *..................................................................................* *Branch :Elep : Elep[Nlpt]/F * *Entries : 7861 : Total Size = 97072 bytes File Size = 61622 bytes * *Baskets : 4 : Basket Size = 32000 bytes EvOffsetLen= 2000 * * : : Branch compression factor = 1.58 * *..................................................................................* Thank you. ========================== __ | Patrice Lebrun | || HEE1 _|__|| IPN de Lyon | |__ tel: 72 44 84 43 |at ==========================
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