ILoAddends.Item

Syntax

Item(Index: Integer): ILoAddend;

Parameters

Index - index of summand in the collection.

Description

The property is read-only.

The Item property returns the summand from the collection by its index.

Example

Sub Main;

Var

FPAS: LinearDecomposition;

Vrbl: ILoVariable; //variable with retrospective

Addend: ILoAddend; //summand

Eq: ILoEquation; //equation

VarS: ILoVariables; //list of variables

AddendS: ILoAddends; //list of summands

EqS: ILoEquations; //list of equations

Res: ILinDecompResults;

Retro, Forestall: Array[2] Of double;

I: integer;

TimeInterval: Integer;

S: string;

Begin

FPAS := New LinearDecomposition.Create;

// VARIABLES

Retro := New Double[2];

Retro[0] := 1;

Retro[1] := 2;

Forestall := New Double[2];

Forestall[0] := 3;

Forestall[1] := 4;

Vars:= FPAS.Variables;

For I := 1 To 2 Do

s := "x" + i.ToString;

Vrbl:=Vars.Add(s);

Vrbl.Retrospective := Retro;

Vrbl.Forestall := Forestall;

End For;

//EQUATIONS

EqS := FPAS.Equations;

// EQUATION #1

Eq := EqS.Add;

AddendS := Eq.Addends;

Addend := Addends.Add(Vars.FindById("x1")); //left side of equation

Addend.Coeff := 1;//variable held constant

Addend.Lag := 0;//lag

Addend := Addends.Add(Vars.FindById("x1")); //first summand

Addend.Coeff := 2;//variable held constant

Addend.Lag := 1;//lag

Addend := Addends.Add(Vars.FindById("x1"));//second summand

Addend.Coeff := 0.25 ;//variable held constant

Addend.Lag := -1;//lag

For i := 0 To Addends.Count - 1 Do

Addend := Addends.Item(i);

Debug.WriteLine("Variable " + Addend.Variable + " added to equation #1");

End For;

// EQUATIOn #2

Eq := EqS.Add;

AddendS := Eq.Addends;

Addend := Addends.Add(Vars.FindById("x2")); //left side of equation

Addend.Coeff := 1;//variable held constant

Addend.Lag := 0;//lag

Addend := Addends.Add(Vars.FindById("x1")); //first summand

Addend.Coeff := 12.6;//variable held constant

Addend.Lag := -1;//lag

Addend := Addends.Add(Vars.FindById("x2"));//second summand

Addend.Coeff := 26;//variable held constant

Addend.Lag := 1; //lag

For i := 0 To Addends.Count - 1 Do

Addend := Addends.Item(i);

Debug.WriteLine("Variable " + Addend.Variable + " added to equation #2");

End For;

FPAS.Extremum:=ExtremumType.Maximum;

TimeInterval := 5;

Res := FPAS.Evaluate(TimeInterval) As ILinDecompResults;

Debug.WriteLine(Res.ErrorMsg);

End Sub Main;

After executing the example the linear system is calculated, report about system creation process and message with found errors are displayed in the console window.