Dear all,
I would like to fix the step size of a parameter in a fit.
I am using the code below:
static double vstart[npar]; // inital point
static double step[npar]; // step size
TMinuit * theMinuit = new TMinuit(npar); // 3 parameter fit
step[0]=10.0;
step[1]=100.0;
step[2]=1.0;
theMinuit->mnparm(0,"n",vstart[0],step[0],0,0,ierflag);
theMinuit->mnparm(1,"x",vstart[1],step[1],500,1000,ierflag);
theMinuit->mnparm(2,"x0",vstart[2],step[2],0,0,ierflag);
theMinuit->mnexcm("SET ERR", arglist,1,ierflag);
double arglist[npar];
int ierflag =0;
arglist[0] = 1500;
arglist[1] = 1.;
theMinuit->mnexcm("MIGRAD", arglist , 2, ierflag);
As far as I understood from the manual, the values set as step[] in the
command theMinuit->mnparm( ) is the size of only the first step in the
fit procedure.
Is there a way to fix the step size for the hole fit procedure ?
Thank you,
Vitor
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