From: FAIGL Zoltán <>
Date: Wed, 22 Feb 2006 21:39:29 +0100 (CET)

Dear all,

I have created TProfile2D histograms in my work to analyse graphically the dependencies between different data.

The root user guide writes this about TProfile2D histograms:

Profile histograms:
. TProfile: one dimensional profiles
. TProfile2D: two dimensional profiles

Profile histograms are used to display the mean value of Y and its RMS for each bin in X. Profile histograms are
in many cases an elegant replacement of two-dimensional histograms. The inter-relation of two measured
quantities X and Y can always be visualized with a two-dimensional histogram or scatter-plot. If Y is an
unknown but single-valued approximate function of X, it will have greater precisions in a profile histogram than
in a scatter plot.

My question is the following:
Is it true, that by default, when I draw a TProfile histogram, then I get the mean of the values in each bin?

How can we plot only the RMS of the values in each bin? I didn't find this imformation anywhere.

Thank you for your help.
Zoltan Received on Wed Feb 22 2006 - 21:39:44 MET

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