TMtxOptimization.RealFunction Property

Summary

Defines the function to be minimized.

Declaration

Property RealFunction: TRealFunction read FRealFunction write SetRealFunction;

Description

Defines the function to be minimized. The RealFunction must be of the TRealFunction type. Before you write actual function, set the Parameters, Constants and PConstants array size by using the:

VariableParameters vector Length, Size or SetIt method,
ConstantParameters vector Length,Size or SetIt method,
SetPointers method.

See Also
GradProcedure
GradHessProcedure
VariableParameters
ConstantParameters
SetPointers

Example 1

Define a function of two variables and one additional constant parameter.

1) Set the VariableParameters, ConstantParameters size and (optionally) initial value:

        MtxOptimization.VariableParameters.SetIt(false,[1,1]);
    	  MtxOptimization.ConstantParameters.SetIt(false,[2.5]);

        MtxOptimization->VariableParameters->SetIt(false,OPENARRAY(TSample,(1,1)));
    	  MtxOptimization->ConstantParameters->SetIt(false,OPENARRAY(TSample,(2.5)));

Note that all values are real.

2) Define the actual function:

      function TestFunction(Pars:TVec; const Consts: Array of TSample;const ObjConsts: Array of TObject): TSample;
	    begin
        Result := 2*Pars[0]+Sqrt(Pars[1]-Consts[0]);
	    end;

      double __fastcall BTestFunction(TVec * Parameters, const double * Constants, const int Constants_Size,
        System::TObject* const * ObjConst, const int ObjConst_Size)
      {
        double* Pars = Parameters->PValues1D(0);

        return 2*Pars[0] + Sqrt(Pars[1]-Consts[0]);
      }

Here Pars = VariableParameters.Values and Consts = ConstantParameters.Values.

3) "Connect" the function with TMtxOptimization component:

      MtxOptimization.RealFunction := TestFunction;

      MtxOptimization->RealFunction = TestFunction;

NOTE: Internal algorithm does not check if Parameters, Constants, PConstants array size is the same as VariableParameters.Values, ConstantParameters.Values and SetPointers array size.