Added a possible userFcn-implementation of Gaussian and Lorentzian static and dynamic LF relaxation functions to musrfit. Read the README

src/external/libLFRelaxation/TLFRelaxation.h

@@ -0,0 +1,105 @@
+/***************************************************************************
+
+  TLFRelaxation.h
+
+  Author: Bastian M. Wojek
+  e-mail: bastian.wojek@psi.ch
+
+  2008/12/04
+
+***************************************************************************/
+
+#ifndef _TLFRelaxation_H_
+#define _TLFRelaxation_H_
+
+#include<vector>
+#include<cstdio>
+
+using namespace std;
+
+#include "TMath.h"
+#include "PUserFcnBase.h"
+#include "fftw3.h"
+#include "TIntegrator.h"
+
+class TLFStatGssKT : public PUserFcnBase {
+
+public:
+  TLFStatGssKT();
+  ~TLFStatGssKT();
+
+  double operator()(double, const vector<double>&) const;
+
+private:
+  TIntSinGss *fIntSinGss;
+
+  ClassDef(TLFStatGssKT,1)
+};
+
+class TLFStatLorKT : public PUserFcnBase {
+
+public:
+  TLFStatLorKT();
+  ~TLFStatLorKT();
+
+  double operator()(double, const vector<double>&) const;
+
+private:
+  TIntBesselJ0Exp *fIntBesselJ0Exp;
+
+  ClassDef(TLFStatLorKT,1)
+};
+
+class TLFDynGssKT : public PUserFcnBase {
+
+public:
+  TLFDynGssKT();
+  ~TLFDynGssKT();
+
+  double operator()(double, const vector<double>&) const;
+
+private:
+  mutable vector<double> fPar;
+  mutable bool fCalcNeeded;
+  mutable bool fFirstCall;
+  string fWisdom;
+  unsigned int fNSteps;
+  double fDt;
+  double fDw;
+  double fC;
+  fftw_plan fFFTplanFORW;
+  fftw_plan fFFTplanBACK;
+  double *fFFTtime;
+  fftw_complex *fFFTfreq;
+  mutable unsigned int fCounter;
+
+  ClassDef(TLFDynGssKT,1)
+};
+
+class TLFDynLorKT : public PUserFcnBase {
+
+public:
+  TLFDynLorKT();
+  ~TLFDynLorKT();
+
+  double operator()(double, const vector<double>&) const;
+
+private:
+  mutable vector<double> fPar;
+  mutable bool fCalcNeeded;
+  mutable bool fFirstCall;
+  string fWisdom;
+  unsigned int fNSteps;
+  double fDt;
+  double fDw;
+  double fC;
+  fftw_plan fFFTplanFORW;
+  fftw_plan fFFTplanBACK;
+  double *fFFTtime;
+  fftw_complex *fFFTfreq;
+  mutable unsigned int fCounter;
+
+  ClassDef(TLFDynLorKT,1)
+};
+
+#endif //_LFRelaxation_H_