Re: [ROOT] Redimensioning

From: Rene Brun (Rene.Brun@cern.ch)
Date: Thu Aug 01 2002 - 23:15:02 MEST


Hi Alberto,

Very likely, your function has some peculiar parameter values
that generate infinite values on the y scale. When saving the function
to a file, precomputed function values are saved at TH1::fNpx points.
An interpolation is done when reading the canvas with the function.
A  canvas.root file would be more useful than gif files.

Rene Brun


On Thu, 1 Aug 2002, Alberto Garcia Raboso wrote:

> Hi ROOTers,
> 
> I have some profiles, already drawn, that I have to fit (so I do it).
> Everything's OK up to this point, but, when I try to draw the fit
> function, everything's KO. Although I use the "same" option, it seems
> that ROOT goes crazy, maybe because the fit function has asymptotes, and
> thus changes the scale in the y axis.
> 
> I think I've tried almost everything, but I can't get to redimension it
> to the desired range from the command line. So, I've had to implement a
> loop to modify the range in which the function is drawn to manually
> specify it until it is OK. More or less, the problem is solved, but this
> forces me to stand in front of the screen during the running (a not very
> interesting activity).
> 
> So, does anybody have an idea about how to arrange it so I could go to
> have a coffee? Thanks in advance.
> 
> Cheers,
> 
> Alberto
> 
> P.S.: By the way, when I save the canvas as a ".root" file and try to
> open it later, I get a difference. Have a look on the files "before.gif"
> and "after.gif" at /afs/cern.ch/user/g/graboso/public/. The fitting
> range is [-300, 300].
> 



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