Re: TProfile2D

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