From: FAIGL Zoltán <szlaj_at_mcl.hu>

Date: Mon, 27 Feb 2006 10:01:40 +0100 (CET)

Date: Mon, 27 Feb 2006 10:01:40 +0100 (CET)

Thank you for the solution.

So If I would like to draw the TProfile2D of RMS values, than I must fill a TProfile2D with my values, than for each bin read the RMS values with p->GetBinError(), and fill these values in a TGraph3D instance. I mean this is the simplest solution.

If not, please tel me about a simpler one.

Best regards,

Zoltan Faigl

On Sat, 25 Feb 2006, Rene Brun wrote:

*> see example below for a TProfile. You can change the example*

*> to produce a TProfile2D in the same way.*

*>*

*> Rene Brun*

*>*

*>*

*> void profile() {*

*> TProfile *p = new TProfile("p","test profile",50,-3,3);*

*> p->SetErrorOption("s");*

*> TRandom r;*

*> for (Int_t i=0;i<10000;i++) {*

*> Double_t x = r.Gaus(0,1);*

*> Double_t y = r.Gaus(0,1);*

*> p->Fill(x,x*x+y*y);*

*> }*

*> p->Draw();*

*> for (Int_t i=1;i<=50;i++) {*

*> printf("bin: %2d, mean = %g, rms = %g\n",i,*

*> p->GetBinContent(i),p->GetBinError(i));*

*> }*

*> }*

*>*

*>*

*> On Wed, 22 Feb*

*> 2006, FAIGL Zoltán wrote:*

*>*

*> > 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.*

*> > Br.*

*> > Zoltan*

*> >*

Received on Mon Feb 27 2006 - 10:01:53 MET

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