Hi Pat, an example with the file fit3d.C below. To execute, do root > .x fit3d.C++ Rene Brun //file fit3d.C #include "TF3.h" #include "TH3.h" Double_t func3(Double_t *x, Double_t *par) { Double_t r2 = x[0]*x[0] + x[1]*x[1] +x[2]*x[2]; Double_t arg = (TMath::Sqrt(r2) - par[1])/par[2]; Double_t val = par[0]*TMath::Exp(-0.5*arg*arg); return val; } void fit3d() { TF3 *f3 = new TF3("f3",func3,-2,2,-2,2,-2,2,3); f3->SetParameters(10,0,1); TH3F *h3 = new TH3F("h3","h3",20,-2,2,20,-2,2,20,-2,2); Double_t x,y,z; for (Int_t i=0;i<1000000;i++) { f3->GetRandom3(x,y,z); h3->Fill(x,y,z); } h3->Draw("box"); h3->Fit(f3); } Patrick Murray wrote: > > Hi All, > > Could someone point me in the direction of an example or send my an > example of a 3 d fit? I want to fit some data to a surface of a sphere. > > Thank you, > > Pat
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