How set more then 11 parameters for a fit function?

[Divyang]

Hello everyone,

I am trying to fit a curve on the histogram which has more than 11 parameters. However, I noticed that the SetParameters() allows only 11 entries. So, my code is giving an error.

I just want to fit the histogram and in output chi2 minimized parameters. Any suggestion would be a great help. Following is the snippet of the code.

  TF1 *fit2 = new TF1("fit2", my_func, 1, 6., 12);
  fit2->SetParameters(4.96478e+00,
                      2.31372e-01,
                      2.13283e+02,
                      4.71709e-01,
                      5.16176e+00,
                      8.75612e-02,
                      1.22796e+04,
                      1.25758e+00,
                      4.24852e+00,
                      1.34468e-01,
                      1.36518e+02,
                      1.);
  fit2->SetLineColor(kRed);
  fit2->SetLineWidth(4);
  h2->Fit(fit2, "R+");

[smgrig]

Hi,

double pars[12]={1,2,3,4,5,6,7,8,9,10,11,12};
fit2->SetParameters(pars);