Intersectionpoint

[couet]

May be this post can help you:

How to get intersection coordinates

Try the following script: void cross() { TCanvas *c1 = new TCanvas("c1"); c1->SetLogy(); TF1 *a=new TF1("a","5.70e-09*pow(x,-2.0)",40,1000); a->SetMinimum(1e-16); a->SetLineColor(1); a->Draw(); TF1 *b=new TF1("b","2.45e-04*pow(x,-3.7)",40,1000); b->SetLineColor(2); b->Draw("same"); TF1 *c = new TF1("c","abs(a-b)",40,1000); c->Draw("same"); Double_t xminimum = c->GetMinimumX(); printf("xminimum = %g\n",xminimum); TArrow *arrow = new TArrow(xminimum,1e-12…