interpolate in 2D

From: Julia Campa Romero <Julia.Campa_at_ciemat.es>
Date: Thu, 20 May 2010 12:38:03 +0200

HI everybody,

I would like to interpolate in 2D dimension. I mean given a data set
(x,y,z) i would like to obtein the interpolated values for a new set of
(x,y).

I am trying with interpolate ( class TGraph2D) but I have some problems. Perhaps there are more options. The program I have written is below. ( the libraries here are not include). With this I am trying to reproduce the same intial data but some of them are equal to cero and others are ok. here is my program:

---

void readfort22(void){   

 // Fill the 2D graph

     ifstream in;
      in.open("fort.22");
      Double_t R, R1, M, M1, sigma, nu, ep, e1;


     TGraph2D *gr = new TGraph2D();

    //Fill the 2D Graph
      for (Int_t i=0;i<100;i++) {
            in >> R1>> M1 >> sigma >> nu >> ep >> e1;/
            if (!in.good()) break;

    cout<<R1<<" "<<M1<<" "<<ep<<endl;
 gr->SetPoint(i,R1,M1,ep);
  }
  gr->Draw("surf4");

     in.close();
 TGraph2D *gr2 = new TGraph2D();   

      in.open("fort.22");
    for (Int_t i=0;i<100;i++){

          in >> R1>> M1 >> sigma >> nu >> ep >> e1;
      ep = gr->Interpolate(R1,M1);

    cout<<R1<<" "<<M1<<" "<<ep<<endl;
    printf("eps1=%8f\n",ep);
    gr2->SetPoint(i,R1,M1,ep);
}

gr2->Draw("surf4");      

}

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Thanks,

Julia

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Received on Thu May 20 2010 - 12:38:12 CEST