ISmNonLinearOptimization.ObjValByIter

Syntax

ObjValByIter: Array;

Description

The ObjValByIter property returns values of the criterion function by iterations.

Comments

To determine criterion function, use the ISmNonLinearOptimization.FunctionString property.

Example

To execute the example, add a link to the Stat system assembly.

Sub UserProc;
Var
    nlo: ISmNonLinearOptimization;
    lb, ub: Array[0..3] Of Double;
    init: Array[0..3] Of Double;
    LinConCfs: Array[0..3] Of Double;
    LinCons: ISlLinearConstraints;
    LinCon: ISlLinearConstraint;
    NonLinCons: INonLinearConstraints;
    NonLinCon: INonLinearConstraint;
    i, res: Integer;
Begin
    nlo := New SmNonLinearOptimization.Create;
    For i := 0 To 3 Do
        lb[i] := 1;
        ub[i] := 5;
        LinConCfs[i] := 1;
    End For;
    nlo.Boundary.BoundaryLower := lb;
    nlo.Boundary.BoundaryUpper := ub;
    nlo.CoefficientsOrder := "x1;x2;x3;x4";
    nlo.FunctionString := "x1*x4*(x1+x2+x3)+x3";
    init[0] := 1;
    init[1] := 5;
    init[2] := 5;
    init[3] := 1;
    nlo.InitApproximation := init;
    LinCons := nlo.LinearConstraints;
    LinCon := LinCons.Add;
    LinCon.BoundaryLower := -10e20;
    LinCon.BoundaryUpper := 20;
    LinConCfs[0] := 1;
    LinConCfs[1] := 1;
    LinConCfs[2] := 1;
    LinConCfs[3] := 1;
    LinCon.Value := LinConCfs;
    nlo.MaxIteration := 75;
    NonLinCons := nlo.NonLinearConstraints;
    NonLinCon := NonLinCons.Add;
    NonLinCon.BoundaryLower := -10e20;
    NonLinCon.BoundaryUpper := 40;
    NonLinCon.NonLinearFunction := "x1*x1+x2*x2+x3*x3+x4*x4";
    NonLinCon := NonLinCons.Add;
    NonLinCon.BoundaryLower := 25;
    NonLinCon.BoundaryUpper := 10e21;
    NonLinCon.NonLinearFunction := "x1*x2*x3*x4";
    // Do not use analytical derivatives when searching the solution:
    nlo.UseDerivatives := False;
    res := nlo.Execute;
    If res <> 0 Then
        Debug.WriteLine(nlo.Errors);
        Else
            Debug.WriteLine("=== Criterion function value by iterations ===");
            For i := 0 To nlo.ObjValByIter.Length - 1 Do
                Debug.WriteLine(i.ToString + ", " + nlo.ObjValByIter[i].ToString)
            End For;
    End If;
End Sub UserProc;

After executing the example the console window displays criterion function values by iterations.