RE: How to make horizontal histogram and superimposed horizontal fit without "hbar" option ?

From: Olivier Couet <Olivier.Couet_at_cern.ch>
Date: Fri, 9 Oct 2009 09:30:57 +0200

Example:

{

   h = new TH1F("h1","h1",10,-3,3);
   h->FillRandom("gaus",10000);
   h->Fit("gaus");
   for (int bin=1; bin<=10; bin++) {

      h->GetXaxis()->SetBinLabel(bin,Form("Bin #%d",bin));    }
   TF1 *g=h->GetListOfFunctions()->FindObject("gaus");

   Double_t x1 = g->GetXmin();
   Double_t x2 = g->GetXmax();
   Double_t dx = (x2-x1)/100;
   Double_t x[100], y[100];

   x[0] = x1;
   y[0] = g->Eval(x[0]);
   for (int i=1; i<100; i++) {

      x1   = x1+dx;
      x[i] = x1;
      y[i] = g->Eval(x[i]);

   }

   h->GetYaxis()->Set(5,h->GetMinimum(),h->GetMaximum());
   h->GetYaxis()->SetBinLabel(1,"aaa");
   h->GetYaxis()->SetBinLabel(2,"bbb");
   h->GetYaxis()->SetBinLabel(3,"bbb");
   h->GetYaxis()->SetBinLabel(4,"bbb");
   h->GetYaxis()->SetBinLabel(5,"ccc");
   h->Draw("hbar2");

   TGraph *gr = new TGraph(100,y,x);
   gr->Draw("L");
}

-----Original Message-----
From: owner-roottalk_at_root.cern.ch on behalf of liang Sent: Thu 10/8/2009 20:15
To: roottalk_at_root.cern.ch
Cc: owner-roottalk_at_root.cern.ch; Zhijun Liang; Huaqiao Zhang Subject: [ROOT] How to make horizontal histogram and superimposed horizontal fit without "hbar" option ?  

Dear ROOT experts :
I am trying to make plot with horizontal histogram and superimposed horizontal fit , Do you have any idea about how to do it ? We don't want to use "hbar" option , just want a simple horizontal histogram without any filled color , and superimposed a Gaussian fit horizontally .
What I want is just some thing like the plot made the following simple function , but put histogram and Gaussian fit horizontally . Is that possible to do ? Do you have any Any suggestion ? Many Thanks

void makeplot(){
TH1F *h1=new TH1F("h1","h1",100,-3,3);

h1->FillRandom("gaus",10000);
h1->Draw("");
h1->Fit("gaus");

}

Best regards
Zhijun Received on Fri Oct 09 2009 - 09:31:40 CEST