Dear ROOTers,
How can correct my mistakes in my program.It hasn’t compiled correctly.
{
# define CHARGE 3
# define THETA1 10
# define THETA2 180
FILE *fp=fopen("probability1.data","w");
long int step;
int Z;
Z=CHARGE;
double P_{i},P_{j},v_{i},v1,v2,g,v3,v4,x,y;
g=0.5418e-08;
x=sin(THETA1);
y=sin(THETA2 );
ifstream in("vel_spec1.data");
for ( step=0;step<250000;step++) {
in>>v1>>v2
v_{i}=v1;
P_{i}=g*(x**2-y**2)*Z*(1./v_{i})**4;
P1=P1+P_{i};
fprintf(fp,"%.4f\n",P_{i});
}
ifstream in("vel_spec2.data")
for (step=0;step<250000;step++) {
in>>v3>>v4;
v_{j}=v3
P_{j}=g*(x**2-y**2)*Z*(1./v_{j})**4;
P2=P2+P_{j};
fprintf(fp,"\n%.4f\n",P_{j});
}
fclose(fp);
printf("%.4f",2*(P1+P2));
}
I took group of v1,v2,v3,v4 into this:{
TCanvas *c1=new TCanvas(“c1”,"",100,100,600,800);
c1->Divide(1,2);
c1->cd(1);
gPad->SetFillColor(42);
gPad->SetFrameFillColor(33);
TH2F *h = new TH2F(“h”,“Spectrum of velocity”,100,0.7,1.7,100,0.7,1.7);
FILE *fp=fopen(“vel_spec1.data”,“w”);
FILE *fs=fopen(“vel_spec2.data”,“w”);
TRandom r;
Int_t i;
double v1,v2,v3,v4;
for (i=0;i<250000;i++) {
v1=r.Gaus(0.987,.07);
v2=r.Gaus(1.446,.07);
h->Fill(v1,v2);
fprintf(fp,"%.4f\t%.4f\n",v1,v2);
}
for (i=0;i<250000;i++) {
v3=r.Gaus(1.005,.05);
v4=r.Gaus(1.421,.05);
h->Fill(v4,v3);
fprintf(fs,"%.4f\t%.4f\n",v3,v4);
}
fclose(fp);
fclose(fs);
h->Draw(“lego2”);
c1->cd(2);
gPad->SetFillColor(42);
gPad->SetFrameFillColor(33);
h->Draw(“col1”);
h->GetXaxis()->SetTitle(“V1 (cm/ns)”);
h->GetYaxis()->SetTitle(“v2 (cm/ns)”);
h->GetZaxis()->SetTitle(“counts”);
h->GetXaxis()->CenterTitle();
h->GetYaxis()->CenterTitle();
h->GetZaxis()->CenterTitle();
}
Thanks.