Draw from tree against a var3 cut with fixed value

ROOT
1

Hello

While trying to draw two vars when the 3rd has a specific value requirement

tree->Draw("var1:var2","var3=0")

I get

So, I ve tried also couple of more things like

tree->Draw("var1:var2","var3==0")

but nothing works…I guess this is a more generic issue when one asks to have instead of a cut a specific value requirement ?

Thanks

2

The 2nd syntax you used is the correct one. What do you get when you do that ?

3

I get this

(Long64_t)31022

and actually 31022 is the number of my entries in the tree. Further, if I just do

tree->Draw(“var3”,“var3==0”) I get

(Long64_t)0

and nothing is drawn in the canvas, but actually this is how my var3 distr looks like

Thanks

4

It is quite possible that you have no event for which “var3 == 0” (as “var3” seems to be a floating point variable).
Try:
tree->Draw(“var3”, “abs(var3) < 0.001”)