Hi Nick,
1- You are using the old Windows interface that prompts for a number
in the SetLogy function. On all other interfaces, this is just a
toggle. We hope to replace this old interface in the near future
by the Root standard GUI.
2- You misunderstood Florian's request. This was for linear axis.
I gave him a recipee to control somehow the exponent value.
A better interface could be proposed, but certainly not
the one with TPad::SetLogy.
3- When drawing in log scale, the min/max is computed automatically
from the histogram contents and bins or the max/min.
Could you send me an example of plot that does not give a correct
log scale exponent?
Rene Brun
On Fri, 22 Nov 2002, Nick van Eijndhoven wrote:
> 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
> > > phone home: 49/89/32455680 phone HLL: 49/89/839400-33
> > >
> > > e-mail: fls@hll.mpg.de
> > > http://www.gamma.mpe-garching.mpg.de/MEGA/mega.html
> > > ----------------------------------------------------------------------
> > >
>
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