RE: [ROOT] Can I use TF1 in TTree::Draw()

From: Philippe Canal (pcanal@fnal.gov)
Date: Fri Aug 08 2003 - 18:29:37 MEST

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Hi,

You can not really use use TF1 in TTree::Draw (actually in the case your
typed where x is the actual spelling of a tree variable, pTree->Draw("pf")
would do what you expect).  In root 3.05/07 you can use global function
instead.

Cheers,
Philippee

>  -----Original Message-----
> From: 	owner-roottalk@pcroot.cern.ch
> [mailto:owner-roottalk@pcroot.cern.ch] 
> Sent:	Friday, August 08, 2003 11:14 AM
> To:	Roottalk@Pcroot. Cern. Ch
> Subject:	[ROOT] Can I use TF1 in TTree::Draw()
> 
> Hello, 
>   Suppose I have a TF1 I create with 
> 
> 	TF1 *pf = new TF1("pf","[0]+[1]*sqrt(x)",0.,1000.)
> 
> Is it possible to use pf it within a TTree::Draw() call?  I've tried the
> obvious,
> e.g.
> 
> 	pTree->Draw("pf(x)") where x float in pTree
> 
> but, alas, it does not work like sqrt().  Is there a special syntax?  What
> about 
> the build-in formulas, e.g. pol5?  Can I use these?
> 
> I am using win32 version of root v3.05/5 on windows 2k.  Thanks
> 
> Ed Oltman

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