Hi Pete, An example: void h2a() { //create a 2-d array of histograms and draw it const Int_t NX=6, NY=4; TH1F *h1[NY][NX]; Int_t i,j,k=0;; char hname[20]; for (j=0;j<NY;j++) { for (i=0;i<NX;i++) { sprintf(hname,"h%d_%d",j,i); h1[j][i] = new TH1F(hname,"test",10,-4,4); h1[j][i]->SetFillColor(38); h1[j][i]->SetStats(0); } } TCanvas *c1 = new TCanvas("c1"); c1->Divide(NX,NY); for (j=0;j<NY;j++) { for (i=0;i<NX;i++) { h1[j][i]->FillRandom("gaus",100); k++; c1->cd(k); h1[j][i]->Draw("bar2"); } } } Rene Brun On Mon, 22 Apr 2002, Peter Karpius wrote: > Hello! > > I am new to this list and new to Root and C++ in general so please > forgive my ignorance. Anyway, I need to fill a canvas with a 2D array of > histograms. I followed a previous thread to create the histograms and > this seemed to work. Now I am trying to Draw them with a set of nested > loops preceded by a canvas division to match the array dimienions. It > seems that only the last histgram gets drawn overiting the previous ones. > I know this is a simple problem but I am stuck. > > Are there any examples of multidimensional histograms using Draw()? > > Thanks! > > Pete Karpius >
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