I am using v2.23/10 on HPUX10.2 running aCC. I have a macro that plot
several points and do a linear fit. The error on the fitted parameters is
truncated in the stat box. Is there a way to fix this? Below is
the macro I used.
Seng
void plot_mombias() {
gROOT->Reset();
c1 = new TCanvas("c1","HMC Output vs Beam Momentum",200,10,700,500);
c1->SetGrid();
// draw a frame to define the range
TH1F *hr1 = c1->DrawFrame(140,-0.005.,190,0.03);
hr1->SetXTitle("Average Beam Momentum");
hr1->SetYTitle("HMC Estimate - Input Generation Value");
hr1->SetTitleOffset(1.3, "Y");
hr1->SetTitle("HMC Output (Input g=-0.2154) vs Average Beam Momentum");
const Int_t n = 8;
Float_t x[n] = {147.577700,152.554231,157.480476,162.457551,167.479134,172.467954,
177.447382,182.435490};
Float_t ex[n] = {0, 0, 0, 0, 0, 0, 0, 0};
Float_t y[n] = {.12963e-1,.11759e-1,.06063e-1,.08780e-1,.10120e-1,.10231e-1,
.12242e-1,.10814e-1};
Float_t ey[n] = {2.82768e-03, 2.43126e-03,2.17597e-03,2.02725e-03,1.97245e-03,1.94164e-03,
1.97880e-03, 2.05305e-03};
Float_t chi2[n] = {344.125, 368.906, 390.534, 304.297, 383.312, 359.423,
417.878, 393.309};
Float_t dof[n] = {285, 285, 284, 288, 287, 291, 289, 292};
// create graph
gr = new TGraphErrors(n,x,y,ex,ey);
gr->SetMarkerColor(kBlack);
gr->SetLineColor(kBlack);
gr->SetMarkerStyle(20);
gr->Draw("P");
gStyle->SetOptFit(111);
gStyle->SetStatW(0.2);
gStyle->SetStatH(0.1);
TF1 *f1 = new TF1("f1", "[0]+[1]*(x-155)", 145, 185);
gr->Fit("f1");
c1->Print("hybrid_mombias.eps");
}
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