Hello,
I have always this problem:
in a macro, when I try to draw a tree's variable and put the result in a
histogram, the plot disappears as soon it's drawn.
example:
void start()
{
TFile F("~/scratch1/ntuplesLH/mytrees/MyTree_W1000.root");
TTree* T=(TTree*)gDirectory->Get("T");
T->Draw("mmax2_YY>>h","abs(eta_Y[i1max2_YY])<2.5 &&
abs(eta_Y[i2max2_YY])<2.5 && pt_Y[i1max2_YY]>25 &&
pt_Y[i2max2_YY]>25 && mmax2_YY>110");
TH1F* H=(TH1F*)gDirectory->Get("h");
H->Draw();
}
Is there a thing to do to avoid this ? (maybe it's a basic thing to
know, but...)
I know the solution of transferring data of the tree in tables, then
filling a histogram with them, but it's heavy.
I think that an other problem I have is related to this one.
When I try to do (as described in the user guide)
TPaveStats *st=(TPaveStats*) canvas->GetPrimitive("stats");
st->SetFillColor(10);
H->Draw("SAMES");
it doesn't work ("st" not known at the second line).
I think "stats" is not known anymore.
Thank you.
Matthieu.
( I'm using /afs/cern.ch/sw/root/v3.05.05/rh73_gcc2952/root )
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