Hello ROOTers!!
I am new here and I really don’t know if I am having problems with ROOT.
I was studying the exponential decay of a damped pendulum from my physics class, and I am supposed to fit the data, but I got this weird thing here :
Am I doing some mistake?
//using TGraph *pontos = new TGraph(n, px, py);
TF1 *theta = new TF1("Funcao theta", "0.157*exp([0]*x)*cos([1]*x+[2])", 0, 30); //0.157 was measured
theta->SetParameters(-0.00000009,-0.0004,4);
theta->SetNpx(900);
pontos->Fit(theta,"R");
Damped Pendulum:
https://webhome.phy.duke.edu/~rgb/Class/phy51/phy51/node24.html
