Fitting Basics

From: Philip M Borawski (bphilip@utdallas.edu)
Date: Wed Nov 10 1999 - 20:32:52 MET


Please excuse my newbiness here, but I have some very basic questions on
fitting signal plus background interactivley.  

First question, is there a way to set parameters to predefined functions
(gaus for instance)?  

Next, is there a way to interactivley optimize the fit of this 'first
guess'?

This is motivated by common fitting methods in PAW.  For
instance to fit signal+background in PAW one would (for example) do
somthing like:

ve/cr p(7) r 120 1.860 .015 1 1 1 1
h/fit 222 g+p3 m 7 p

and then inside minuit

fix 2,3
mini
impre

Is there an anolog to this method in ROOT?

Any examples or comments would be greatly appreciated.

Thank you in advance


Philip Borawski
University of Texas at Dallas
SLAC/BaBar Collaboration



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