Log Axis

ROOT
1

Hi,

I have filled a histogram in log_10 such that the x axis now goes from -10 -> 0
I would now like to paint the axis correctly such that the histogram has a log axis
HOw would I go about doing this?
… I had a look at TGaxis but was not sure how to implement

Thanks

Maki

2

If you have a TCanvas* c, a TH1*h, do

c->SetLogx(); h->GetXaxis()->SetRange(1e-10,1); h->Draw();
Rene

3

Hi again…
I tried this but it scales the histogram to be log…
all I want to do is take a histogram (which I filled as log_10)
and paint the axis with a log_10 axis, so that the bins of the histogram do not change or get scaled (visually) but the axis has?

Is this possible

thanks

Maki

4

Create your histogram with the variable bin width constructor such that the bins are at equidistant logs between -10 and 0. Then fill your histogram with x and not log(x).

Rene