TMtxExpression.DefineMatrix Method

Overload List

#	Signature	Description
1	function DefineMatrix(const AVarName: string): TMatrixValue;	Use internal matrix.
2	function DefineMatrix(const AVarName: string; const mtx: TMtx): TMatrixValue;	DefineMatrix defines new matrix variable.

Overload 1: function DefineMatrix(const AVarName: string): TMatrixValue;

Use internal matrix.

#	Name	Type	Description
1	AVarName	string

Returns: TMatrixValue

Overload 2: function DefineMatrix(const AVarName: string; const mtx: TMtx): TMatrixValue;

DefineMatrix defines new matrix variable.

#	Name	Type	Description
1	AVarName	string
2	mtx	TMtx

Returns: TMatrixValue

Remarks:

If variable with name AVarName already was definded, it will be redefined and all expressions which contain the symbol AVarName will be recompiled before the next evaluation. External matrix may be assigned as values holder. If external matrix is not assigned, internal matrix will be used.

Examples

uses MtxParseExpr, MtxExpr, MtxParseClass;

procedure Example(MyParser: TMtxExpression);
var A,B: TMatrixValue;
res: Matrix;
begin
    // 1. Define variables
    A := MyParser.DefineMatrix('A');
    B := MyParser.DefineDouble('B');

    // 2. Set values
    A.Value.SetIt(2,2, false, [2,1,3,0]);
    B.Value.SetIt(2,2, false, [1,0,1,1]);

    // 3. Add formula and evaluate,
    MyParser.AddExpr('A+2*B');
    res := MyParser.EvaluateMatrix;
    // res = (4,1; 5,2)
end;