How to set up the attributes of a palette?

ROOT
1

Before setting up the attributes of a palette, the code below was used to get the Axis of the palette,
TPaletteAxis* palette=(TPaletteAxis*)h2->FindObject(“palette”);
but it failed, from the output comment, it showed palette was a nullptr.
but from result file, there is a palette member in TH2D class pointer “h2”, it is shown below:

1685955226326
16859552263261684×1668 185 KB

so how to set up the attributes of a palette?
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ROOT Version: 6.28/04
Platform: Ubuntu 20.04
Compiler: GCC 9.4.0

2

Hi,

what exactly do you want to do with the palette that you need to get its axis? What is the end goal?

3

Did you add

gPad->Update();

as stated in the Docs?

4

@dastudillo , thanks, after implement “gPad->Update()”, everything works well!

5

@yus , i want to add a title(include physics quantity and units) to the palette.

6

I don’t think you need to manipulate with the TPaletteAxis for this, you just need to do

h2->GetZaxis()->SetTitle("Energy [GeV]")
7

@yus , yes, you are right, thanks!