2D THStack, Lego, log, Range Change

ROOT
1

Hi,
I’m trying to stack TH2F s in a lego style, so am using THStack. I set the pad to get a logz axis, but this always falls short of the detail I want to display. How do I change the log limis on the z axis in a 2 dimensional stacked histogram?

I have tried to use the hstack.C example then when it has drawn, change the log scale ranges by hand, and then save the canves as a C file; but on reloading the C file, the range of the z axis revert back to the settings that were there in the first place.

Cheers,
Toby Davies

2

To set the min/max along z of a TH2* h2, do

h2->SetMaximum(maxz); h2->SetMinimum(minz);
Rene

3

Hi,
I tried this method, but it does not seem to work for me; attatched is a modified version of hstack.C which uses the SetMinimum, but does not create the desired effect on the canvas.

Cheers,
Toby
hstack.C (2.05 KB)

4

You must apply the minimum to the stack, ie
replace the statement

h2a->SetMinimum(2.5e-4); by

a->SetMinimum(2.5e-4);

Rene

5

Hi,

this worked- thanks! I realize that I've posted in the wrong place.. sorry about that.

Cheers,
Toby