Re: Histogram Statistics

Rene Brun (Rene.Brun@cern.ch)
Wed, 16 Jun 1999 10:16:56 +0000

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Hi Patrice,
In 2.22/05, GetMean or GetRMS compute these quantities from the bin
contents when an axis range has been specified.
For example when zooming with the mouse on a histogram or scatter-plot
the mean value, rms, etc are recomputed from the current visible range.
I have now implemented in my development version 2.22/06 the facility
to also start from the bin contents in case the normal statistics filled
by TH1::fill are not available (your case).
Thanks for the remark.

Rene Brun

Patrice Lebrun wrote:
>
> Hi,
>
> I have an TH1F histogram filled only in using
> SetBinContent method. Making that, the statistics
> array is not computed.
> I try to use TH1::GetStats(Stat_t *stats) or GetRMS() via
> TAxis::SetRange but
> without sucess.
> Is there a simple way to get mean and RMS values of a such histogram ?
>
> --
> Patrice Lebrun
> Institut de Physique Nucleaire de Lyon
> Phone: 04 72 44 84 43
> Fax: 04 72 43 14 52
>
>

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