Re: [ROOT] exponents in scaling

From: Nick van Eijndhoven (Nick@phys.uu.nl)
Date: Fri Nov 22 2002 - 09:41:34 MET


Hi Rene,
Maybe I misunderstand something, but if I have a plot of
a histo on my canvas and via 'right-clicking' switch to a log
scale on e.g. the y-axis the popup box prompts me for a number.
If I enter 0, the y-axis will stay in linear scale.
If I enter 1, I get a standard log-scale in steps of 10.
I would expect that if I enter e.g. 3 I would get a log scale
in steps of 10**3 etc...
However, I don't think currently it works this way.
In case I am correct, it seems that this procedure is currently not
correctly working.
If I am not correct, could you then please tell me what the number
means which I have to enter. And furthermore, could a functionality
like the above be implemented ? This would solve Florian's problems
and also provide a nice facility to make appropriate plots.

                                                Cheers,
                                                 Nick. 

Rene Brun wrote:
> 
> Hi Florian,
> 
> You have some control on the axis exponent with TGaxis::SetMaxDigits
> Example
> TH1F h("h","h",100,-2,2);
> h.SetMaximum(1e5);
> TGaxis::SetMaxDigits(3);
> h.Draw();
> 
> Rene brun
> 
> On Thu, 21 Nov 2002, Florian Schopper wrote:
> 
> >
> > dear rooters,
> >
> > is there a way to set the exponents in which the scale of y-axis is given?
> > We would like to have always multiples of -3 (milli,mikro,nano,pico...).
> >
> > cheers
> >        Florian Schopper
> >
> >
> >
> > ----------------------------------------------------------------------
> > Dr. Florian Schopper                  office: MPI Halbleiterlabor
> >
> > Ludwig-Merk str. 3                           Otto-Hahn-Ring 6 , Gebäude 72
> > D-80805 München                              D-81739 München
> > Germany                                      Germany
> >
> >
> > fax home:   49/89/3226157                  fax HLL:   49/89/839400-13
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> >
> >                      e-mail: fls@hll.mpg.de
> >        http://www.gamma.mpe-garching.mpg.de/MEGA/mega.html
> > ----------------------------------------------------------------------
> >



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