Re: RE: TProfile means problem

Hi Guys, i am new to ROOT i want to install ROOT in my laptop windows 7x64, can any one suggest me step by step procedure (pdf), waiting for ur reply guys
thanks,
chandu

> ________________________________________
> From: owner-roottalk_at_lxroot01.cern.ch [owner-roottalk_at_lxroot01.cern.ch] On
> Behalf Of Snyder, Arthur E. [snyder_at_slac.stanford.edu]
> Sent: Saturday, July 09, 2011 11:40 PM
> To: Rene Brun
> Cc: roottalk_at_pcroot.cern.ch
> Subject: [ROOT] TProfile means problem
>
> Hello Rene et al.,
>
> I'm having with |TProfile|. When I plot <y> vs. "x" with |TProfile| I get
> values in each x-bin that are ~2 (not exactly 2) times bigger than when I
> just histogram y and read the mean <y> off the histogram.
>
> Has this happen'd before? I don't see where |TProfile| is getting the
> number it is plotting. It is not, e.g, the RMS. The ratio to the mean is
> 2.15 -- not exactly 2.0.
>
> I tried to get the y-distribution |TProfile| uses, but can find a function
> that extracts it. Perhaps |TProfile| uses big y-bins and calculating means
> from bin centers rather than event average. Is that possible? This doesn't
> seem to be what the documentation says though ...
>
> The distribution of y is steeply falling from zero -- roughly exponential.
> The statistics are large even in each x-bin.
>
> ?
>
> -Arthur S.
>
> ________________________________________
>
>
Received on Tue Jul 19 2011 - 07:01:55 CEST