Re: TDSet

From: Marc Escalier <escalier_at_lal.in2p3.fr>
Date: Mon, 6 Sep 2010 11:46:03 +0200

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 - 11:46:11 CEST