Move to the pro release 3.05/07
Rene Brun
On Mon, 11 Aug 2003
jgonzalez@hepmail.physics.neu.edu wrote:
> Hi all
>
> I got the following problem with the script I attached in the end:
>
> It works fine but when I place the cursor on top of the pad then a message
> appears "Error: operator '/' divided by zero FILE:like.C LINE:10"
>
> The weird thing is that 0 shouldn't be in the range for any parameter so
> how come root is evaluating the function there?
>
> In case you are interested:
> root version 3.05/03
>
> Thanks
>
> Javier
>
> P.s.: here goes the file (copy pasted)
>
> Float_t loglike(Double_t* x, Double_t* par)
> {
> Float_t loglikelihood = 0;
> Float_t level[5] = {0.7,0.8,0.9,1.0,1.2};
> Float_t time[5] = {38.36,41.63,45.33,49.97,55.39};
>
> if(x[1] == 0) cout << "x[1] is zero!!" << endl;
> for(int i = 0; i != 5; i++)
> {
> Float_t calcul = (0.3066/x[1] + 0.1749*(1-x[0])*(level[i]+0.2838) +
> 0.003522);
> loglikelihood += pow( (time[i] - calcul),2.0)/2;
> }
> return loglikelihood;
> }
>
> void like()
> {
> // x_range is (0.8,0.98) y_range is (1000.0,10000.0)
>
> TF2* chi2 = new TF2("chi2",loglike,0.8,0.98,1000.0,10000.0,0);
> TCanvas* micanvas = new TCanvas();
> chi2->Draw();
>
>
> }
>
>
>
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