Hi, Is there a reason one can't use the mouse to zoom in on the y axis of a TF1 ? Here is an example where one can zoom in on the x and y axis with the mouse for a TGraph, but not so for a TF1. (root v3_02_07c, Linux+2.2) { new TCanvas(); c1->Divide(1,2); // Make a graph int N = 100; int i = 0; double X[N], Y[N]; for (double d = -5; d < 4.9; d+= 0.1) { X[i] = d; Y[i] = (d+0.5)*(d+0.5)+ 3.0 ; i++; } TGraph *G = new TGraph(N,X,Y); c1->cd(1); // I can zoom the x and y axes with the mouse G->Draw("AC"); // Make a function TF1 *F = new TF1("F","(x+0.5)*(x+0.5)+3.0",-5,5); c1->cd(2); // I can only zoom the x axis with the mouse F->Draw(); // But the following work // F->SetMinimum(2); // F->SetMaximum(7); } Cheers, Ben
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