I draw values from a TTree in a histogramm like
aTree->Draw("fData->Signal","fData->fPlaneNumber==1");
where fData is a pointer to a TClonesArray in events in the TTree.
So far so good.
My event has another TClonesArray with a pointer fTracks to it.
I try to draw the same histogram under a certain condition
of values in the second TClonesArray, like
aTree->Draw("fData->Signal","fData->fPlaneNumber==1 &&
fTracks->fChiSquare<30.");
The second cut has no effect.
Also I tried something like
aTree->Draw("fData->Signal:fTracks->fChiSquare","fData->fPlaneNumber==1");
which gives a histogram which make no sense..
I can draw these histograms, of course if I read the events
in a loop and fill a histogramm according to the cuts.
But I would like to do it in one commandline.
Is such a construction impossible?
Dirk Meier