Change significant figures of the axis labels

ROOT
1

How to change the significant figures of the axis labels when drawing a TGraph object ? Please can you give me some instructions?
Thanks!

2

TGaxis::SetMaxDigits(ndigits);

3

Thank you! But it doesn’t seem to work. Maybe ROOT has not provided this function.

4

Can you provide a small example macro showing what you get ?

5

Maybe I failed to describe my thought clearly. Here is an example:

void DrawAxis()
{
TCanvas c1 = new TCanvas(“c1”,“Example of Gaxis”,10,10,700,500);
c1->Range(0,0,1,1);
TGaxis axis=new TGaxis(0.1,0.1,0.9,0.1,0,2,505,"");
axis->SetMaxDigits(2);
axis->Draw();
}

By calling axis->SetMaxDigits(2), I wish to get axis label values like:
0, 0.5, 1.0, 1.5, 2.0
But the result wouldn’t change no matter wether or not I called this function, the axis label values are:
0, 0.5, 1, 1.5, 2

I appreciate very much your help, can you give some advise?

6

use TAxis::SetDecimals

Rene

7

Thanks Rene, it DOES work! haha!