[ROOT] Profile RMS

From: Vincent Régnard (regnard@ganil.fr)
Date: Mon Dec 15 2003 - 15:22:16 MET


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Hello all,
I am playing with the profile representation of 2Dhisto but encountering some 
strange behaviour:
I fill a 2Dhisto from a tree then call for the ProfileX method to get the 
profile and plot it.
Means are ok, but variance (on the graphical representation) seems to be a 
lot under estimated, it seems ther is a wrong multiplication factor 
somewhere. Meanwhile a 1D plot of a slice along X gives me the right answer 
with correct mean and width which is not reproduced after in the profile.
Hope you can help me.

You find a superposition of a counter plot and associated profile here:
http://vincentregnard.free.fr/tmp/profile.png
and the code responsible for that koind of result there:
http://vincentregnard.free.fr/tmp/alpha.C

I am using root version 3.10.01 on GNU/Debian gcc 3.0.4

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