Gets and sets the value at the specified position. Zero matrix elements are not stored, so assigning a non-zero value to a matrix element above the diagonal of the matrix raises an exception.

public double this[
	int row,
	int col
] { get; set; }

Public Default Property Item ( _
	row As Integer, _
	col As Integer _
) As Double

public:
property double default[int row, int col] {
	double get (int row, int col);
	void set (int row, int col, double value);
}