Hi, I noticed that when the plotting interval is very different from the interval where a TF1 is defined, undesired white gaps (or margins) appear around the plot. The more you zoom in, the larger the gaps are. Here is a very simple macro and the corresponding plot I obtain illustrating the problem…

Let’s ask our graphics expert @couet

See [image] Two plotting aesthetics questions (TGraph and TAxis) Newbie For the function line issue, it’s because your functions are defined from 9.5 (or 10.5 as you would like) to 200 (even though you are only plotting up to 37), and by default ROOT draws TF1 by sampling …

{ TCanvas *TestCanvas = new TCanvas("Test", "Test",600,600); // We want to plot only on a range between 0 and 2. TestCanvas->DrawFrame(0, 0, 2, 3); // A TF1 defined with a range between 0 and 2. auto fa2 = new TF1("fa2","1.05 + sin(x)/x",0,2); fa2->SetLineColor(kGreen+3); fa2->…

Thanks for this answer! Obviously, this solution (using SetNpx) cannot be used when the TCanvas is saved as a .C macro, since only the points are saved, and not the actual formula. That would mean functions should be created from the start with a number of points high enough. Correct?

No, it is not correct. Here is the saved canvas as a .C file. You can see SetNpx is there. #ifdef __CLING__ #pragma cling optimize(0) #endif void Test() { //=========Macro generated from canvas: Test/Test //========= (Fri Oct 25 14:02:11 2024) by ROOT version 6.33.01 TCanvas *Test = new TCanvas…

Hi, Gaps appears because of the way how TF1 painting is implemented. Actually not the function, but histogram is drawn. By default histogram contains 100 points, but you can change number by calling fa1->SetNpx(500);. X position of each point defined by center of each histogram bin which is cr…

[image] linev: You can try set TF1 range slightly more than visible range, but ROOT painting probably will not extend your drawing to frame border. In a sense it is not really satisfying to have the curve of a function not plotted over the full range on which you want the function to be plot…

Undesired empty gaps when plotting TF1 functions

ROOT

dastudillo October 25, 2024, 10:29am 3

See