Re: TH1 Basic (and old) questions

Laurent Aphecetche (aphecetche@ganil.fr)
Tue, 04 Nov 1997 18:52:52 +0100

Rene Brun wrote:
> This could be implemented. However, to be consistent, one would haveto
> also implement
> TH1::SetRange(xmin,xmax,ymin,ymax)
> TH1::setRange(xmin,xmax,ymin,ymax,zmin,zmax)
> TH1::SetRange(binx1,binx2)
> TH1::SetRange(binx1,binx2,biny1,biny2),etc
> TH1::SetRange(binx1,xmax,...) and all possible combinations
>
> If we implement TH1::Draw(xmin,xmax), we should also support
> all the above combinations.
> and what about TH1::Fit
> and what about the function you are proposing below as well.

Of course, this seems to be some work...
But zooming a histo. is a very common action of users, I guess, and
interactive
zoom with the slider is not precise at all, so there should be an easy
way to do it.

Is someone sharing this point of view ?

> > 2) What about a TH1::GetIntegral(xmin,xmax) function to have to sum of
> > weights between xmin and xmax ?
>
> I would prefer TH1::GetIntegral(binx1,binx2) and same for 2-D.
> Otherwise if xmin,xmax do not coincide with the lower/upper limits
> of a bin, do you expect this function to compute an approximation
> for the integral in the bins at the edge, or do you simply want
> to compute the bin number where xmin and xmax (bin1,bin2)correspond
> and return the integral as the suim of bin contents from bin1 to bin2
> included?

Agree. TH1::GetIntegral(bin1,bin2) would be nice enough.

-- 
APHECETCHE Laurent (mailto:aphecetche@ganil.fr)       
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