calculation results.Item(Index: Integer): ILoVariable;
Index - variable index in the collection.
The property is read-only.
The Item property returns the variable from the collection by its index.
Example
Sub Main;
Var
Optima: NonLinearOptimization;
Vars: INonLoVariables; //list of variables
Vrbl: INonLoVariable; //variable
VarConstr: IVarConstraint; //variable constraint
VarConstrs: IVarConstraints; //list of variable constraints
RetroX1: Array[3] Of Double;
RetroX2: Array[3] Of Double;
RetroU: Array[3] Of Double;
RetroV: Array[3] Of Double;
Funstions: Array[2] Of String;
Res: INonLoResults;
TimeInterval: Integer;
s: String;
ci: ICultureInfo;
j, i: Integer;
val: Double;
Begin
Optima := New NonLinearOptimization.Create;
RetroX1[0] := 2;
RetroX1[1] := 2.1;
RetroX1[2] := 2.2;
RetroX2[0] := 1;
RetroX2[1] := 0.9;
RetroX2[2] := 0;
RetroU[0] := 1;
RetroU[1] := 1.5;
RetroU[2] := 0;
RetroV[0] := 0.5;
RetroV[1] := 0.75;
RetroV[2] := 0;
// VARIABLES and constraints
Vars := Optima.Variables;
Vrbl := Vars.Add("x1");
Vrbl.Retrospective := RetroX1;
Vrbl.CoefficientsOrder := "x1[t];x1[t-1];x1[t-2];;x1[t-3]";
VarConstrs := Vrbl.Constraints;
VarConstr := VarConstrs.Add;
VarConstr.LowerBound := -101;
VarConstr.UpperBound := 101;
VarConstr.Lag := 3;
VarConstr := VarConstrs.Add;
VarConstr.LowerBound := -102;
VarConstr.UpperBound := 102;
VarConstr.Lag := 2;
VarConstr := VarConstrs.Add;
VarConstr.LowerBound := -10030;
VarConstr.UpperBound := 10030;
VarConstr.Lag := 1;
VarConstr := VarConstrs.Add;
VarConstr.LowerBound := -13040;
VarConstr.UpperBound := 13040;
VarConstr.Lag := 0;
Vars := Optima.Variables;
Vrbl := Vars.Add("x2");
Vrbl.Retrospective := RetroX2;
Vrbl.CoefficientsOrder := "x2[t];x2[t-1];x2[t-2]";
VarConstrs := Vrbl.Constraints;
VarConstr := VarConstrs.Add;
VarConstr.LowerBound := -201;
VarConstr.UpperBound := 201;
VarConstr.Lag := 3;
VarConstr := VarConstrs.Add;
VarConstr.LowerBound := -202;
VarConstr.UpperBound := 202;
VarConstr.Lag := 2;
VarConstr := VarConstrs.Add;
VarConstr.LowerBound := -203;
VarConstr.UpperBound := 203;
VarConstr.Lag := 1;
VarConstr := VarConstrs.Add;
VarConstr.LowerBound := -12040;
VarConstr.UpperBound := 12040;
VarConstr.Lag := 0;
//Controlling variable
Vars := Optima.Variables;
Vrbl := Vars.Add("u");
Vrbl.Retrospective := RetroU;
Vrbl.ControlVariable := True;
Vrbl.CoefficientsOrder := "u[t];u[t-1]";
VarConstrs := Vrbl.Constraints;
For i := 0 To 3 Do
VarConstr := VarConstrs.Add;
VarConstr.LowerBound := 0;
VarConstr.UpperBound := 1;
VarConstr.Lag := i;
End For;
//Controlling variable
Vars := Optima.Variables;
Vrbl := Vars.Add("v");
Vrbl.Retrospective := RetroV;
Vrbl.ControlVariable := True;
Vrbl.CoefficientsOrder := "v[t];v[t-1]";
VarConstrs := Vrbl.Constraints;
For i := 0 To 3 Do
VarConstr := VarConstrs.Add;
VarConstr.LowerBound := 0.8;
VarConstr.UpperBound := 4;
VarConstr.Lag := i;
End For;
Funstions := New string[2];
Funstions[0] := "0.3 * x1[t-1] + 0.1 * x2[t-2] + u[t-1] * x1[t-1] *x2[t-1]";
Funstions[1] := "-0.2 * x1[t-1] + 0.4 *x2[t-1] + (x1[t-1] * x2[t-2])/v[t-1]";
Optima.Equations := Funstions;
Optima.CriterionFunction := "x1[t] * x1[t] - x1[t] * x2[t]";
TimeInterval := 4;
Optima.NodesCount := 2;
Optima.MaxIterationsCount := 1500;
Optima.MethodType := CpNonLinearMethodType.SequentialQP;
Optima.Tolerance := 0.0001;
Optima.Extremum := ExtremumType.Maximum;
Res := Optima.Evaluate(TimeInterval) As INonLoResults;
s := "Optimal value: " + Res.OptimalValue.ToString;
Debug.WriteLine(s);
s := " ";
For j := 1 To Vars.Count Do
Vrbl := Vars.Item(j - 1);
s := s + Vrbl.Id + " ";
End For;
Debug.WriteLine(s);
ci := CultureInfo.Current;
For i := 1 To TimeInterval Do
s := "t=" + i.ToString + ", ";
For j := 1 To Vars.Count Do
Vrbl := Vars.Item(j - 1);
Val := Res.VarValues(Vrbl.Id)[i - 1];
s := s + ci.FormatDoublePrec(Val, 6) + ", ";
End For;
Debug.WriteLine(s);
End For;
s := "Status : " + Res.Status.ToString;
Debug.WriteLine(s);
s := "Error : " + Res.ErrorMsg;
Debug.WriteLine(s);
End Sub Main;
After executing the example the console window displays calculation results.
See also: