Use TF1 as weight in chain.Draw()

[osh]

Dear Experts,

I am trying to fill a TH1F from a TChain doing something like this:

myChain.Draw(“myVar>>myHist”, “myTF1(myOtherVar)”, “goff”)

Where myTF1 is found by fitting some data.

Is this possible? I get “TSelectorDraw::AbortProcess: Variable compilation failed”.

Thank you,

• Marc

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ROOT Version: 6.12
Platform: Scientific Linux CERN SLC release 6.10 (Carbon)
Compiler: python (trying this in pyroot)

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[couet]

It seems there is a missing double quote in the command you posted. But I guess in your real script it is not the case ?

[osh]

Hi Couet,

Yes, I just edited it to avoid confusion. What I posted is just meant to be pseudocode.

• Marc

[pcanal]

@osh

myChain.Draw(“myVar>>myHist”, “myTF1(myOtherVar)”, “goff”)

this will work if myTF1 is a C++ function known to the interpreter.