Plotting Ntuple Components on a single Canvas

Newbie
1

I have Ntuple which contain data of four variables. (x:y:z:t)

I am trying to draw 4 histogram on a single canvas but only getting a single histogram.


f = ROOT.TFile(filename)
c = ROOT.TCanvas()
c.Divide(2,2)
c.cd(4)
f.n.Draw("t>>h(100,-10,40)","","COLZ")
# finish the drawing in each pad
c.cd(3)
f.n.Draw("z>>h(100,-10,40)","","COLZ")

c.cd(2)
f.n.Draw("y>>h(100,-10,40)","","COLZ")

c.cd(1)
f.n.Draw("x>>h(100,-10,40)","","COLZ")

# Draw the Canvas
c.Draw()

__

ROOT Version: Not Provided
Platform: Python
Compiler: Not Provided

2

You are filling 4 times the same histogram with different ntuple variables.
Change the histogram name for each Draw command.
Also note that the COLZ option does not apply on 1D histograms.

1 Like
3

Thanks it worked.


f = ROOT.TFile(filename)
c = ROOT.TCanvas()
c.Divide(2,2)
c.cd(4)
f.n.Draw("t>>h(100,-10,40)","","COLZ")
# finish the drawing in each pad
c.cd(3)
f.n.Draw("z>>g(100,-10,40)","","COLZ")

c.cd(2)
f.n.Draw("y>>s(100,-10,40)","","COLZ")

c.cd(1)
f.n.Draw("x>>e(100,-10,40)","","COLZ")

# Draw the Canvas
c.Draw()
4

Again, the COLZ option is not meaningful in case of 1D plots.
Change "COLZ" to ""

1 Like