Re: plot("same")

Eduard,

SetMinimum and SetMaximum help with the z-range. But the x and y ranges are plotted wrong, too.
(I could define the function over the same range as the histogram, but it just seems like this should work even when the ranges are different.)

  Holger

On 02/08/2011 03:52 PM, Eduard Avetisyan wrote:
> Hello Holger,
>
> See below:
>
> On Tue, 8 Feb 2011, Holger Meyer wrote:
>
>
>> Hello,
>>
>> how can I plot a histogram and a function in the same canvas so that
>> both use the same scale?
>> This macro (problem.C) shows the problem:
>>
>>
>> Double_t Gaus2D(Double_t *x, Double_t *par)
>> {
>> if(par[2] > 0 && par[4] > 0)
>> {
>> double rx=(x[0]-par[1])/par[2];
>> double ry=(x[1]-par[3])/par[4];
>> return par[0]*TMath::Exp(-(rx*rx+ry*ry)/2.);
>> }
>> else
>> return 0.;
>> }
>>
>> problem() {
>> TCanvas* cnv = new TCanvas("cnv","Canvas",800,400);
>> cnv->Divide(2);
>> cnv->cd(1);
>>
>> //draw a histogram
>> TH2F* h2 = new TH2F("h2","Hist2D",50,-25.,25., 50,-25.,25.);
>> h2->SetBinContent(1275,10.);
>> h2->Draw("lego");
>>
>> //draw a function in another pad so it is easy to compare the range
>> cnv->cd(2);
>> TF2* f = new TF2("g2d",Gaus2D,-10.,10.,-10.,10.,5);
>> f->SetParameter(0,10.);
>> f->SetParameter(1,2.);
>> f->SetParameter(2,3.);
>> f->SetParameter(3,0.);
>> f->SetParameter(4,3.);
>> f->SetLineColor(616);
>> f->Draw("surf");
>>
>> //plot the same function superimposed on the histogram
>> //Why does it not respect the axis range given in this pad by the
>> histogram?
>> cnv->cd(1);
>>
> f->SetMaximum(h2->GetMaximum());
> f->SetMinimum(h2->GetMinimum());
>
>> f->Draw("surf,same");
>> }
>>
>>
>>
>> Thanks,
>> Holger
>>
>>