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MinuitFitter.cc
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MinuitFitter.cc
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#include "MinuitFitter.hh"
#include "TGraph.h"
#include "TCanvas.h"
#include "TF1.h"
#include "TH2F.h"
#include <math.h>
MinuitFitter::MinuitFitter(ShapingCurve *sc, int sCount, int pCount, double noise) : Fitter(sc, sCount, pCount, noise)
{
if (gMinuit==NULL) gMinuit = new TMinuit();
guess_par = (double *) calloc(2*pCount, sizeof(double));
tweakFCN = false;
}
MinuitFitter::~MinuitFitter()
{
free(guess_par);
}
void MinuitFitter::doMinuitFit()
{
initMinuit();
double arglist[10];
int ierflg = 0;
int i;
for (i=0; i<nPeaks; i++)
{
gMinuit->DefineParameter(2*i,"time",guess_par[2*i],25.0,-100.0,200.0);
gMinuit->DefineParameter(2*i+1,"height",guess_par[2*i+1],1.0*guess_par[2*i+1],0.0,50.0);
}
arglist[0] = 1000;
gMinuit->mnexcm("SIMPLEX", arglist ,1,ierflg);
status = ierflg;
if (false && status == 0)
{
arglist[0] = 1000;
gMinuit->mnexcm("IMPROVE", arglist ,1,ierflg);
}
for (i=0; i<2*nPeaks; i++)
{
gMinuit->GetParameter(i,fit_par[i],fit_err[i]);
}
dof = nSamples-2*nPeaks;
if (tweakFCN)
{
tweakFCN = false;
for (i=0; i<nPeaks; i++)
{
gMinuit->DefineParameter(2*i,"time",fit_par[2*i],5.0,-100.0,200.0);
gMinuit->DefineParameter(2*i+1,"height",fit_par[2*i+1],0.05*fit_par[2*i+1],0.0,50.0);
}
arglist[0] = 1000;
gMinuit->mnexcm("SIMPLEX", arglist ,1,ierflg);
status = ierflg;
if (status == 0)
{
arglist[0] = 1000;
gMinuit->mnexcm("IMPROVE", arglist ,1,ierflg);
}
for (i=0; i<2*nPeaks; i++)
{
gMinuit->GetParameter(i,fit_par[i],fit_err[i]);
}
tweakFCN = true;
}
}
void MinuitFitter::doFit()
{
makeGuess();
doMinuitFit();
}
double MinuitFitter::memberFCN(double *par)
{
size_t i,j;
double delta, delta2;
double chisq = 0;
double Yi;
double b;
int firstPeak;
for (i = 0; i < nSamples; i++)
{
if (!useSample[i]) continue;
Yi = 0;
double t = startTime+sampleInterval*i;
Yi = shape->getSignal(t,nPeaks,par);
delta = (Yi - y[i]);
if (tweakFCN && Yi<2*sigma[i]) //if sample is before all the t0's, use the distance to the leading edge instead of the residual
{
firstPeak = -1;
for (j=0;j<nPeaks;j++)
{
if (par[2*j]+10.0>t && par[2*j]-20.0<t && (firstPeak==-1 || par[2*j]<par[2*firstPeak]))
firstPeak = j;
}
if (firstPeak!=-1)
{
b = par[2*firstPeak+1]*shape->getSlope(0); //slope of leading edge
delta2 = (y[i]-b*(t-par[2*firstPeak]))/sqrt(1+b*b);
if (delta2>0 && fabs(delta2) < fabs(delta))
delta = (0.0*fabs(delta)+1.0*fabs(delta2));
}
}
delta /= sigma[i];
chisq += delta*delta;
}
return chisq/(nSamples-2*nPeaks);
}
void MinuitFitter::memberGradFCN(double *par, double *gin)
{
size_t i,j;
double delta;
double Yi;
double dchisq = 0;
for (i=0;i<2*nPeaks;i++)
gin[i] = 0;
for (i = 0; i < nSamples; i++)
{
if (!useSample[i]) continue;
double t = startTime+sampleInterval*i;
Yi = 0;
for (j=0; j<nPeaks; j++)
{
Yi += par[2*j+1] * shape->getHeight(t-par[2*j]);
}
for (j=0; j<nPeaks; j++)
{
delta = (Yi - y[i])/(sigma[i]*sigma[i]);
gin[2*j] += -2.0*delta*par[2*j+1]*shape->getSlope(t-par[2*j]);
gin[2*j+1] += 2.0*delta*shape->getHeight(t-par[2*j]);
}
}
}
void MinuitFitter::initMinuit()
{
currentFitter = this;
gMinuit->SetFCN(FCN);
//gMinuit->SetPrintLevel(-1);
gMinuit->Command("CLE");
gMinuit->Command("SET NOW");
//gMinuit->Command("SET WAR");
gMinuit->Command("SET STR 2");
//gMinuit->Command("SET GRA 1");
gMinuit->Command("SET ERR 1");
}
void MinuitFitter::setTweakFCN(bool x)
{
tweakFCN = x;
}
bool MinuitFitter::getTweakFCN()
{
return tweakFCN;
}
void MinuitFitter::plotFit(Event *evt, char *name)
{
currentFitter = this;
double *t, *h;
int i,j;
TGraph *graph;
TCanvas *c1 = new TCanvas("c1","c1",10,10,1000,750);
TF1 *func;
TH2F *hpx = new TH2F("hpx","",10,-25.0,175.0,10,-5.0,30.0*nPeaks); // axis range
hpx->SetStats(kFALSE); // no statistics
hpx->DrawCopy();
delete hpx;
t = (double *) calloc(nSamples, sizeof(double));
h = (double *) calloc(nSamples, sizeof(double));
for (i=0;i<nSamples;i++)
t[i] = startTime+i*sampleInterval;
graph = new TGraph(nSamples,t,y);
graph->DrawClone("*");
delete graph;
j=0;
for (i=0;i<nSamples;i++)
{
if (useSample[i])
{
t[j] = startTime+i*sampleInterval;
h[j] = y[i];
j++;
}
}
graph = new TGraph(j,t,h);
graph->SetMarkerColor(2);
graph->DrawClone("*");
delete graph;
free(t);
free(h);
func = new TF1("curve",evt,&Event::Evaluate,-100.0,200.0,0);
func->SetLineWidth(1);
func->SetNpx(1000);
func->DrawCopy("CSAME");
delete func;
func = new TF1("curve",evtCurve,-100.0,200.0,2*nPeaks);
t = (double *) calloc(nPeaks, sizeof(double));
h = (double *) calloc(nPeaks, sizeof(double));
getFitTimes(t);
getFitHeights(h);
for (i=0;i<nPeaks;i++)
{
func->FixParameter(2*i,t[i]);
func->FixParameter(2*i+1,h[i]);
}
func->SetLineColor(2);
func->DrawCopy("CSAME");
delete func;
char funcname[100];
for (j=0;j<nPeaks;j++)
{
sprintf(funcname,"curve %d",2*j);
func = new TF1(funcname,FCNCurve,-100.0,200.0,2*nPeaks+1);
func->SetLineWidth(1);
func->SetNpx(1000);
for (i=0;i<2*nPeaks;i++)
{
func->FixParameter(i,fit_par[i]);
}
func->FixParameter(2*nPeaks,(double)j);
func->SetLineColor(2*j+3);
func->DrawCopy("CSAME");
delete func;
sprintf(funcname,"curve %d",2*j+1);
func = new TF1(funcname,FCNCurve2,-100.0,200.0,2*nPeaks+1);
func->SetLineWidth(1);
func->SetNpx(1000);
for (i=0;i<2*nPeaks;i++)
{
func->FixParameter(i,fit_par[i]);
}
func->FixParameter(2*nPeaks,(double)j);
func->SetLineColor(2*j+4);
func->DrawCopy("CSAME");
delete func;
}
c1->SaveAs(name);
delete c1;
}
void MinuitFitter::setVerbosity(int verbosity)
{
gMinuit->SetPrintLevel(verbosity);
verbose = verbosity;
}
void MinuitFitter::makeGuess()
{
int i,j;
double min, max;
double *dy = (double *) calloc(nSamples, sizeof(double));
dy[0] = y[0];
for (i=0;i<nSamples-1;i++) dy[i+1]=y[i+1]-y[i];
min = -1;
for (j=0;j<nPeaks;j++)
{
max = 0;
for (i=0;i<nSamples;i++)
{
if ((min<0 || dy[i]<min) && dy[i]>max)
{
max = dy[i];
}
}
min = max;
}
j=0;
for (i=0;i<nSamples;i++)
{
if (dy[i]>=min)
{
if (j==nPeaks)
{
if (verbose>2) printf("bad makeGuess; min = %f\n",min);
break;
}
guess_par[2*j] = startTime+sampleInterval*i;
guess_par[2*j+1] = dy[i];
j++;
}
}
free(dy);
}
void MinuitFitter::print_guess()
{
int i;
printf("Times:\t\t");
for (i=0;i<nPeaks;i++)
printf("%lf\t",guess_par[2*i]);
printf("\n");
printf("Heights:\t");
for (i=0;i<nPeaks;i++)
printf("%lf\t",guess_par[2*i+1]);
printf("\n");
}
void MinuitFitter::setGuess(int i, double time, double height)
{
guess_par[2*i] = time;
guess_par[2*i+1] = height;
}
double MinuitFitter::guessChisq()
{
return getChisq(guess_par);
}
void FCN(Int_t&npar, Double_t*gin, Double_t&f, Double_t*par, Int_t flag)
{
MinuitFitter *theFitter = (MinuitFitter *)currentFitter;
switch(flag)
{
case 1:
// Initialization
break;
case 2:
// theFitter->memberGradFCN(par,gin);
// Compute derivatives
// store them in gin
break;
case 3:
// after the fit is finished
break;
default:
f = theFitter->memberFCN(par);
break;
}
}
Double_t FCNCurve(Double_t *x, Double_t *par)
{
MinuitFitter *theFitter = (MinuitFitter *)currentFitter;
bool temp = theFitter->getTweakFCN();
theFitter->setTweakFCN(true);
int i, n;
n = theFitter->getNumPeaks();
double *newpar = (double *) calloc(2*n, sizeof(double));
int k = (int)par[2*n];
for (i=0;i<2*n;i++)
newpar[i] = par[i];
newpar[2*k] = x[0];
double y = theFitter->memberFCN(newpar);
free(newpar);
theFitter->setTweakFCN(temp);
return y;
}
Double_t FCNCurve2(Double_t *x, Double_t *par)
{
MinuitFitter *theFitter = (MinuitFitter *)currentFitter;
bool temp = theFitter->getTweakFCN();
theFitter->setTweakFCN(false);
int i, n;
n = theFitter->getNumPeaks();
double *newpar = (double *) calloc(2*n, sizeof(double));
int k = (int)par[2*n];
for (i=0;i<2*n;i++)
newpar[i] = par[i];
newpar[2*k] = x[0];
double y = theFitter->memberFCN(newpar);
free(newpar);
theFitter->setTweakFCN(temp);
return y;
}