void FitFunc(double x, vector < double> ca, double &y, vector < double> &dyda, int na)
{
int i;
for(i = 0; i < na; i++)
{
Formel.Set_Variable(vars[i], ca[i]);
}
y= Formel.Get_Value(x);
for (i = 0; i < na; i++)
{
Formel.Set_Variable(vars[i], ca[i] + EPS);
dyda[i] = Formel.Get_Value(x);
dyda[i] -= y;
dyda[i] /= EPS;
Formel.Set_Variable(vars[i], ca[i] - EPS);
}
}
bool CFit::On_Execute(void)
{
int i, j, NrVars;
vector < double> x, y, StartValue, Result;
CSG_String msg;
CSG_Parameters StartParameters;
const SG_Char *formel = Parameters("FORMEL")->asString();
Formel.Add_Function(SG_T("NUG"), (TSG_PFNC_Formula_1) NUG, 1, 0);
Formel.Add_Function(SG_T("SPH"), (TSG_PFNC_Formula_1) SPH, 2, 0);
Formel.Add_Function(SG_T("EXP"), (TSG_PFNC_Formula_1) EXP, 2, 0);
Formel.Add_Function(SG_T("LIN"), (TSG_PFNC_Formula_1) LIN, 2, 0);
Formel.Set_Formula(formel);
if (Formel.Get_Error(msg))
{
Message_Add(msg);
return false;
}
const SG_Char *uservars = NULL;
uservars = Formel.Get_Used_Variables();
NrVars = 0;
for (i = 0; i < SG_STR_LEN(uservars); i++)
{
if (uservars[i] >='a' && uservars[i] <= 'z')
{
if (uservars[i] != 'x')
vars[NrVars++] = uservars[i];
}
}
vars[NrVars] =(char) 0;
StartParameters.Add_Info_String(NULL, _TL(""), _TL("Formula"), _TL("Formula"), formel);
for (i = 0; i < strlen(vars); i++)
{
CSG_String c(vars[i]);
StartParameters.Add_Value(NULL, c, c, _TL("Start Value"), PARAMETER_TYPE_Double, 1.0);
}
Dlg_Parameters(&StartParameters, _TL("Start Values"));
for (i = 0; i < strlen(vars); i++)
{
char c[3];
sprintf(c, "%c", vars[i]);
StartValue.push_back(StartParameters(c)->asDouble());
}
CSG_Table *pTable = Parameters("SOURCE")->asTable();
int Record_Count = pTable->Get_Record_Count();
int yField = Parameters("YFIELD")->asInt();
int xField = Parameters("XFIELD")->asInt();
bool Use_X = Parameters("USE_X")->asBool();
pTable->Add_Field(_TL("Fit") , SG_DATATYPE_Double);
for (i = 0; i < Record_Count; i++)
{
CSG_Table_Record * Record = pTable->Get_Record(i);
if (Use_X)
{
x.push_back(Record->asDouble(xField));
}
else
{
x.push_back(i);
}
y.push_back(Record->asDouble(yField));
}
TLMFit *Fit;
Fit = new TLMFit(x, y, StartValue, FitFunc);
int max_iter = Parameters("ITER")->asInt();
double Max_lamda = Parameters("LAMDA")->asInt();
int iter = 0;
try
{
Fit->Fit();
while ((Fit->Alamda() < Max_lamda) &&(iter < max_iter) &&Process_Get_Okay(true))
{
Fit->Fit();
iter++;
}
}
catch (ESingularMatrix &E)
{
if (E.Type == 1 || E.Type == 2)
{
msg.Printf(_TL("Matrix signular\n"));
Message_Add(msg);
return false;
}
}
Result = Fit->Param();
for (i = 0; i < NrVars; i++)
{
Formel.Set_Variable(vars[i], (double) Result[i]);
}
msg.Printf(_TL("Model Parameters:"));
Message_Add(msg);
for (i = 0; i < NrVars; i++)
{
msg.Printf(SG_T("%c = %f\n"), vars[i], Result[i]);
Message_Add(msg);
}
msg.Printf(_TL("\nRMS of Residuals (stdfit):\t%f\n"), sqrt(Fit->Chisq()/x.size()));
Message_Add(msg);
msg.Printf(_TL("Correlation Matrix of the Fit Parameters:\n"));
Message_Add(msg);
vector< vector < double> > covar = Fit->Covar();
msg.Printf(_TL(""));
for (j = 0; j < NrVars; j++)
msg.Printf(SG_T("%s\t%c"), msg.c_str(), vars[j]);
msg.Printf(SG_T("%s\n"), msg.c_str());
Message_Add(msg);
for (i = 0; i < NrVars; i++)
{
msg.Printf(SG_T("%c"), vars[i]);
for (j = 0; j <= i; j++)
{
msg.Printf(SG_T("%s\t%f"), msg.c_str(), covar[i][j]/covar[i][i]);
}
msg.Printf(SG_T("%s\n"), msg.c_str());
Message_Add(msg);
}
int Field_Count = pTable->Get_Field_Count();
for (i = 0; i < Record_Count; i++)
{
CSG_Table_Record * Record = pTable->Get_Record(i);
Record->Set_Value(Field_Count - 1, Formel.Get_Value(x[i]));
}
// API_FREE (uservars);
return (true);
}