Re: Re: pyroot objects

HI any one know how to load acquroot , comple ,run , i downloded pdf file but it not that much clear about how to load acquroot , how to write programs, comple and run the program , please help me cheers
chandu

On Thu, Aug 11, 2011 at 6:30 AM, Yngve Inntjore Levinsen < yngve.inntjore.levinsen_at_cern.ch> wrote:

> On Wed. 10. of August 2011, wlavrijsen_at_lbl.gov wrote:
> > Yngve,
> >
> > TTree's already have a __iter__, but its implementation is differently
> from
> > your choice: it iterates over entries, not over branches.
> >
> > As for getting all entries into a numpy array, I can't think of anything
> > faster, as one has to read them, but one optimization usually helps,
> which
> > is to switch off any branches not used in the iteration (so that their
> values
> > are not loaded during the loop) and/or to use those branches directly
> instead
> > of the tree (the TTree::GetEntry loops over all branches, which is a
> waste if
> > you're only interested in a few branches).
> >
> > Best regards,
> > Wim
> >
>
> Hi,
>
> Well no, to get it faster in a python script will be difficult I guess
> (unless I did some stupid mistakes which slows things down), but one could
> write a c implementation
> (or cython as suggested), since numpy is also written in C...
>
> Was not aware that TTree already was iterating. Chosing entries over
> branches probably makes sense, I have a very narrow view of what kind of
> use-cases one
> should account for, and how to think properly in ROOT-terms.
>
> Cheers,
> Yngve
>
>
Received on Thu Aug 11 2011 - 13:57:43 CEST