Re: plot("same")

From: <nguler_at_jlab.org>
Date: Tue, 8 Feb 2011 18:19:17 -0500


I believe what you want is:

   f->SetRange(-25,25,-25,25);
Hope that helps, - Nevzat

> 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
>>>
>>>
>
>

Received on Wed Feb 09 2011 - 00:19:25 CET

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