Hi Rene,
Thanks for your quick reply; indeed the Query works as expected.
As mentioned somewhat earlier, it would be nice to have from
the TTreeViewer the facility of loading a single entry based
on some specified conditions (e.g. a LoadEntry button on the
panel, which obeys the selection criteria). The selection
criateria could then by something like ientry==3 but also
EVT==101 like in the example I gave below.
Cheers,
Nick.
--
Dr. Nick van Eijndhoven mailto:nick@phys.uu.nl http://www.phys.uu.nl/~nick
--------------------------------------------------------------------------
Org.: Utrecht University/Nikhef, Department of Subatomic Physics
Address: Princetonplein 5, NL-3584 CC Utrecht, The Netherlands
Phone: +31-30-2532331(direct) +31-30-2531492(secr.) Fax: +31-30-2518689
NIKHEF: +31-20-5922178(direct) +31-20-5922000(secr.) Fax: +31-20-5925155
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Rene Brun wrote:
>
> Hi Nick,
>
> You can try:
>
> tree.Query("BRHIST.Draw()"," EVT==101");
>
> or tree.Scan instead of Query
>
> Rene Brun
>
> On Tue, 11 Jun 2002, Nick van Eijndhoven wrote:
>
> > Dear friends,
> > In performing some data analysis I want to create an output tree
> > of which a certain branch BRHIST contains a histogram.
> > The tree contains of course several entries of which each entry has
> > a certain event number stored as EVT.
> > In my analysis I would like to display for a certain event (let's say
> > EVT==101) the corresponding histogram from the branch BRHIST.
> > How should I achieve this ?
> > Obviously I would like to use the TTreeViewer facility of the tree
> > for it, since on basis of how the histo looks like I would also like
> > to investigate several other variables of that event.
> >
> > Cheers,
> > Nick.
> > --
> > Dr. Nick van Eijndhoven mailto:nick@phys.uu.nl http://www.phys.uu.nl/~nick
> > --------------------------------------------------------------------------
> > Org.: Utrecht University/Nikhef, Department of Subatomic Physics
> > Address: Princetonplein 5, NL-3584 CC Utrecht, The Netherlands
> > Phone: +31-30-2532331(direct) +31-30-2531492(secr.) Fax: +31-30-2518689
> > NIKHEF: +31-20-5922178(direct) +31-20-5922000(secr.) Fax: +31-20-5925155
> > CERN: +41-22-7679751(direct) +41-22-7675857(secr.) Fax: +41-22-7679480
> > Offices: Buys Ballot lab. 710 (Utrecht) N241 (Nikhef) B23 1-020 (CERN)
> > --------------------------------------------------------------------------
> >
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