Hello rooters, I am using THStack class to draw some histograms in the same pad and I found I could not zoom in/out along y-axis but could do along x-axis. Following macro is a part of my macro. Something wrong ? : : TCanvas *c = new TCanvas("c", "", 10, 10, 550, 750); c->Divide(2, 3); THStack *hstack_laxis[6]; Char_t hstackname[20]; for ( Int_t i = 0; i < 6; i++ ) { sprintf(hstackname, "hstack_laxis %d", i); hstack_laxis[i] = new THStack(hstackname, ""); c->cd(i+1); gPad->SetLogx(); hlaxis[0][i]->Sumw2(); hlaxis[1][i]->Sumw2(); hlaxis[0][i]->Scale(1.0/nentries[0]); hlaxis[1][i]->Scale(1.0/nentries[1]); hlaxis[0][i]->SetLineColor(2); hlaxis[1][i]->SetLineColor(4); hstack_laxis[i]->Add(hlaxis[0][i]); hstack_laxis[i]->Add(hlaxis[1][i]); hstack_laxis[i]->Draw("nostack a ehist"); gPad->Modified(); } : : (hlaxis[2][6] are decleared and filled before this routine.) I also checked hstack.C in $ROOTSYS/tutrials as well as my macro. But, I could not get the zooming action along y-axis. What method can I use for zoomig action when use THStack class. I use ROOT v 3.03/04 on IRIX 6.5 and g++ 2.95.2. Harufumi Tsuchiya.
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