Re: TProfile2D

From: FAIGL Zoltán <szlaj_at_mcl.hu>
Date: Mon, 27 Feb 2006 10:35:08 +0100 (CET)


Thank you, that was I were asking for.

Zoltan Faigl

On Mon, 27 Feb 2006, Rene Brun wrote:

> There is no TGraph3D class (I assume you mean TGraph2D).
> You do not need to copy the errors to a TGraph2D object, simply
> draw the TProfile2D object with the "e" option as shown in the example
> below
>
> Rene Brun
>
>
> void profile2d() {
> TProfile2D *p = new TProfile2D("p","test profile",20,-3,3,20,-3,3);
> p->SetErrorOption("s");
> TRandom r;
> for (Int_t i=0;i<100000;i++) {
> Double_t x = r.Gaus(0,1);
> Double_t y = r.Gaus(0,1);
> p->Fill(x,y,x*x+y*y);
> }
> p->Draw("e1");
> p->Print("all");
> }
>
>
> On
> Mon, 27
> Feb
> 2006, FAIGL Zoltán wrote:
>
> > 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 - 10:35:20 MET

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