RE: [ROOT] Using interpreted functions in TTree::Draw()

From: Philippe Canal (pcanal@fnal.gov)
Date: Fri Dec 27 2002 - 18:47:48 MET 

Hi Brett,

This is currently not supported (and is not planed for).  However, we plan
to introduce an improvement to TTree::Draw where you will be able to write a
small script that will have access to both the tree branch and the
interpreted function.

Cheers,
Philippe

-----Original Message-----
From: owner-roottalk@pcroot.cern.ch
[mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of Brett Viren
Sent: Thursday, December 26, 2002 9:19 AM
To: ROOT-TALK ML
Subject: [ROOT] Using interpreted functions in TTree::Draw()


Hi,

Say one has an interpreted function: "float func(float x)" is it
possible to somehow call it in the context of a TTree::Draw()?  For
example, say one has a tree with branch fX, is it possible to do the
equivalent of:

	mytree->Draw("func(fX)");

?  Precisely the above doesn't work.

I understand an implicit histogram definition followed by filling in a
loop which calls TTree::GetEvent() would work but if the above
syntactic sugar is available, I'd like to know about it.

Thanks,
-Brett.

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