Re: TDSet

From: Marc Escalier <escalier_at_lal.in2p3.fr>
Date: Mon, 6 Sep 2010 12:58:01 +0200

Hi,

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On Mon, 6 Sep 2010, Zhongxin CAO wrote:

> excuse me....
> how to quit this mail group,roottalk ?
> Thanks!
>
> Cao Zhongxin(???)
> School of Physics, PKU, Beijing, China
>
>
>
>
> On Mon, Sep 6, 2010 at 17:46, Marc Escalier <escalier_at_lal.in2p3.fr> wrote:
> thanks Gerardo
>
>    What do you want to achieve?
>
>
> i would like, for a given TDSet, know the number of entries
> and do a kind of truncature of the number of entries to a given number
>
> thank you
>
> ============================
>
> On Mon, 6 Sep 2010, Gerardo Ganis wrote:
>
>
>   Hi,
>
> On 09/05/2010 07:57 PM, Marc Escalier wrote:
> Hello,
>
> would you know how to do, for a TDSet (which
> is different to a TChain) :
> -change the number of entries
> (for a TChain, it is TChain::SetEntries(...)
>
>    This does not make sense in TDSet, since you are not
> filling any tree.
>    What do you want to achieve?
>
> -read the number of entries
> (for a TChain, it is TChain::GetEntries(...)
>
>   This is not available. You have to loop over the
> elements.
>
>   Note that TDSet maps the dataset as needed internally by
> PROOF and is not
>   supposed to be a replacement of TChain.
>
>   Gerri
>
>
>
>
>
>
>
Received on Mon Sep 06 2010 - 12:58:07 CEST