Re: ROOT Enhancement Request

From: Rene Brun (Rene.Brun@cern.ch)
Date: Tue May 20 1997 - 15:44:19 MEST


Torsten Henkel wrote:
> 
> ** Electronic Enhancement Request Form **
> 
> Name:           Torsten Henkel
> E-mail address: Torsten.Henkel@cern.ch
> 
> Enhancement urgency: normal
> 
> ENHANCEMENT DESCRIPTION:
> Hello,
> 
> I'm not sure if I'm right here or if I only do not see the
> right way to get what I want.
> 
> What I want to do is to set the number of colors for a
> 2-dim histogram drawn with the 'col'-option because there
> are too much colors and on a grayscale plot from the printer
> one can not see what's realy going on because different
> colors are  represanted by the same gray.
> The second question is how can I set a logarithmic z-scale?

Hi Torsten,
You can change the number of colors for the 'col' option via
   gStyle->SetPalette(int ncolors, int *colors)
if colors is missing (or 0) you get gray scale automatically.
Try, for example gStyle->SetPalette(10);

To set the logz scale for a pad/canvas:
  canvas->SetLogz(1);

Rene Brun



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