So I am fitting my data with either a predefinded function “expo” or 1/x². I want to know the x Value where the y value equals to 1. Can I do that in a for loop or is that not possible at all?
cheers
couet
June 27, 2019, 6:07am
2
May be this post can help you:
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…
Hi,TF1::GetX() method is what you are searching for.
Cheers,
system
July 11, 2019, 7:37am
4
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