[ROOT] user-defined function in Draw

From: Martin Schroedter (martins@physics.arizona.edu)
Date: Tue Apr 08 2003 - 22:12:41 MEST 

Hi,

can someone tell me how to apply a user-defined function to a leaf? 
Let's say I have data in a leaf called "length", then i can histogram 
the sqrt(length)
tree->Draw("sqrt(length)")

How can I use my own function instead of sqrt()? The obvious (to me) 
choice does not work:

TF1 func("func","1+2*x",2,6);
tree->Draw( "func.Eval(length)" );

*ERROR 26 :
  Unknown name : "func.Eval(length)"

Thank you,
	Martin

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