Re: TH1::ProfileX

From: Rutger van der Eijk (r36@nikhef.nl)
Date: Wed Nov 24 1999 - 18:50:22 MET


Hi Rene,

An 'request for enhancement' concerning these projection/profile
members. It would be nice if a profile or projection of a histogram can
be made 'with the mouse', i.e. by clicking on the histogram and selecting
the profile/project member. This could easily be implemented by adding
// *MENU* in the code. The only problem I see is 'who' becomes the owner
of the newly creared object... What do you think?

Rutger

On Wed, 24 Nov 1999, Rene Brun wrote:

> Hi Rutger,
> Thanks for reporting this inconsistency. I fixed the following
> functions:
>     TH1::ProfileX
>     TH1::ProfileY
>     TH1::ProjectionX
>     TH1::ProjectionY
>     TH1::ProjectionZ
> 
> 
> Rene Brun
> 
> Rutger van der Eijk wrote:
> > 
> > Hi rooters,
> > 
> > I'm using TH1::ProfileX on a TH2D to get a profile plot. If I compare this
> > profile plot with the same profile made directly (i.e. at the time
> > entries in TH2D are filled) I see a slight difference in number of
> > entries.
> > 
> > I was wondering if this has to do with the under and overflow bins. Are
> > they correctly taken into account? (Do they actually exist for 2D, 3D
> > histograms??)
> > 
> > I see in TH1::ProfileX
> > ...
> >   if (firstybin < 0) firstybin = 0;
> >   if (lastybin > ny) lastybin = ny;
> > ...
> > shouldn't this be:
> >   if (firstybin < 0) firstybin = 0;
> >   if (lastybin > ny + 1) lastybin = ny + 1;
> > 
> > Cheers,
> > 
> > Rutger van der Eijk
> 



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