Re: ROOT Enhancement Request

Rene Brun (Rene.Brun@cern.ch)
Tue, 20 May 1997 15:44:19 +0200

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