How to overlay one histogram on another?

[Svyatoslav]

I have 2 histogram and can’t overlay one histogram on two. Only add to one another.

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[OSchaile]

guess you talk about drawing:

h1->Draw();
h2->Draw("same");

for details consult the docu:
https://root.cern/doc/v620/classTHistPainter.html#HP060

Otto

[couet]

If you need to compute common X and Y scales for the two histograms, you can also use THStack.

[Svyatoslav]

My histograms is in different files and I open them through ROOT Object browser

[Svyatoslav]

I tried to use the THStack, but it stacks them, not overlays them.

[Wile_E_Coyote]

your_stack->Draw("NOSTACK");

[Svyatoslav]

And how can I use it fron browser?

[couet]

As soon as you deal with more complex objects like THStack the browser is quickly not efficient and limits the amount of ROOT functionalities you can use (C++ programming
, etc …) . You can put the option “NOSTACK” in the “Draw Option” field … but that’s not a really good solution.

[OSchaile]

if you do it the simple way with option “same”
you can do it with the TBrowser:
Select the first file and draw the hist1 (double click)
Then select the second file, press with the right mouse
your desired hist2 and choose DrawClone.
A widget will show up, fill in the option same (without the “”)
and press ok

Otto