インピーダンス測定とカーブフィッティング（５）

従って、もし全てを１つのマクロで記述するとすれば、以下のようになります。

// file name = myetst41.cc
{
  TGraph *g = new TGraph("myfile3.dat");
  g->SetMarkerStyle( 20 ); 
  g->SetMarkerSize( 0.5 );
  g->Draw("AP");
  TF1 *f1 = new TF1("f1", "[0]*sin([1]*x+[2])-[3]");
  f1->SetParameter(0, 2000.0);
  f1->SetParameter(1, 0.022);
  f1->SetParameter(2, 0.0);
  f1->SetParameter(3, 0.0);
  f1->SetLineColor(kRed);
  g->Fit(f1);

  TGraph *h = new TGraph("myfile4.dat");
  h->SetMarkerStyle( 24 ); 
  h->SetMarkerSize( 0.5 );
  h->Draw("P");
  TF1 *f2 = new TF1("f2", "[0]*sin([1]*x+[2])-[3]");
  f2->SetParameter(0, 2000.0);
  f2->SetParameter(1, 0.022);
  f2->SetParameter(2, 0.0);
  f2->SetParameter(3, 0.0);
  f2->SetLineColor(kYellow);
  h->Fit(f2);

  double amp, phase;
  amp   = f2->GetParameter(0) / f1->GetParameter(0);
  phase = f2->GetParameter(2) - f1->GetParameter(2);
  std::cout << amp << ", " << phase << std::endl;

  TComplex v1, v2, v3, Z, z50;
  v1  = TComplex(1.0, 0.0);
  v2  = TComplex( amp*TMath::Cos(phase), amp*TMath::Sin(phase) );
  v3  = 2.0*v1 - v2;
  z   = v2/v3;
  z50 = 50.0*z;
  std::cout << v1 << ", " << v2 << ", " << v3 << ", " << z << ", " << z50 << std::endl;

  TComplex rho;
  double vswr;
  rho  = (z-1.0)/(z+1.0);
  vswr = (1.0+TComplex::Abs(rho)) / (1.0-TComplex::Abs(rho));
  std::cout << rho << ", " << vswr << std::endl;
}

% root mytest41.cc
0.778415, -0.53185
(1,0i), (0.670893,-0.394757i), (1.32911,0.394757i), (0.382788,-0.410701i), (19.1394,-20.535i)
(-0.329107,-0.394757i), 3.1148