Re: How access files in from from CASTOR

From: Rene Brun <Rene.Brun_at_cern.ch>
Date: Fri, 17 Apr 2009 07:42:59 +0200


Instead of

    TFile f =
do

    TFile *f = TFile::Open("....")

Rene Brun

Wajid Ali Khan wrote:
>
> Hi All,
> I want to access a root file in root via TFile f = .......... but does
> not work. Can some body help me in this regard.
>
> Regards
>
> Wajid Ali
>
>
>
> -----Original Message-----
> From: owner-roottalk_at_root.cern.ch on behalf of Arthur E. Snyder
> Sent: Thu 4/16/2009 10:38 PM
> To: Rene Brun
> Cc: roottalk_at_lxbuild091.cern.ch; Arafat Gabareen Mokhtar; Stephen
> Jacob Sekula
> Subject: [ROOT] Uncertainty on error access ..
>
> Hello,
>
> I guess this is really, underneath a minuit problem:
>
> How to you get access to the uncertainy in the error printed on the fit
> output?
>
> This can be substantial even when status assigned to the error matrix is
> "3" indicating all is well.
>
> I can't find any function that will let me obtain the uncertainty on the
> error within my root program (that's scanning fit).
>
> -Art S.
>
> PS. this wouldn't matter much normally, but in this case I'm taking the
> quadrature difference between nominal fit and fit with some other
> parameters released in order to get the contribution to the error from
> the released parameters. When the difference is small a 5-10% error can
> matter a lot ..
>
>
>
> A.E. Snyder, Group EC \!c*p?/
> SLAC Mail Stop #95 ((. .))
> Box 4349 |
> Stanford, Ca, USA, 94309 '\|/`
> e-mail:snyder_at_slac.stanford.edu o
> phone:650-926-2701 _
> http://www.slac.stanford.edu/~snyder
> <http://www.slac.stanford.edu/%7Esnyder> BaBar
> FAX:650-926-2657 Collaboration
>
>
>
Received on Fri Apr 17 2009 - 07:43:27 CEST

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