Draw more TF1/TH1D in the same canvas

ROOT
1

Hey,

is it somehow possible to draw more than one TF1/TH1D in one canvas for function comparison.
If it is not possible to combine the data, would it be possible to only draw the shapes?

BR

2

Try something->Draw(); and then something_else->Draw(“SAME”).
See:
http://root.cern.ch/root/html/THistPainter.html#HP060
http://root.cern.ch/root/html/TF1.html#TF1:Draw

3

Option SAME will be very likely enough.

If you need to compute a common range for all the plots you may need:
root.cern.ch/root/html/THStack.html

4

Thank you for your answers.
->Draw(“SAME”) works but only if used “directly” for some reason.
Does not work (example):

TF1* function[4];
for (int i(0); i<4; ++i) 
{
function[i] = new TF1();
function[i]->Draw("SAME");
}

Works (example):

TF1* function[4]; for (int i(0); i<4; ++i) { function[i] = new TF1(); } function[0]->Draw("SAME"); function[1]->Draw("SAME"); function[2]->Draw("SAME"); function[3]->Draw("SAME");

Any ideas?

BR

5

better do:

TF1* function[4];
function[0] = new TF1();
function[0]->Draw();

for (int i=1; i<4; ++i)  {
   function[i] = new TF1();
   function[i]->Draw("SAME");
}
6

Thank you. This way it works like expected.

BR

7

Note, the option “SAME” requires that something has already been drawn before (it will reuse axes and so on). So, the very first “Draw” command must be without “SAME”.