Re: log plots

From: Rene Brun (Rene.Brun@cern.ch)
Date: Wed Aug 25 1999 - 08:20:39 MEST


Hi Sean,
You can find an example in the Root tutorial zdemo.C, see URL:
    http://root.cern.ch/root/html/examples/zdemo.C.html

You can use TPad::DrawFrame (as in zdemo.C) or
create a TH1F or TH2F to set the scale/draw axis.

Rene Brun

Sean Kelly wrote:
> 
> 
> Hi Rooters,
> 
> I'm trying to get a semi-log plot to show graphical data that
> varies over 12 orders of magnitue.
> 
> eg.
> 
>   c1->SetLogy();
>   gr = new TGraph(145,mtv,ptinv_dndpt);
>   gr->Draw("AP");
> 
> when I make the plot the graph only shows data > 10^7.
> The vectors mtv and ptinv_dndpt are filled correctly
> with data that ranges in decades from 10^0 to 10^12.
> 
> any ideas are appreciated.
> 
> Sean
> 
> _____________________________________________
> 
> Sean Kelly
> Dept. of Physics
> University of California Los Angeles
> office tel. (310)-825-6035
> fax (310)-206-4397
> voice mail (310)-259-3747
> _____________________________________________



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