Matrix.DotProd Method

function DotProd(const Vec: TMtxVec; VecIndex: Integer; Index: Integer; Len: Integer): Double;

Scalar product of two real arrays.

#	Name	Type	Description
1	Vec	TMtxVec
2	VecIndex	Integer
3	Index	Integer	start index
4	Len	Integer	element count

Returns: Double

Remarks:

Returns the scalar product between Vec elements [VecIndex]..[VecIndex+Len-1] and calling object elements [Index]..[Index+Len-1]. An exception is raised if Vec and calling object Matrix.Complex property is True. An exception is raised if Matrix.ConditionCheck is True and array borders are overrun or underrun. The dot product is defined by the equation:

\text{V}\cdot \text{V} = \sum _{k=0} ^{\text{Length}-1}\text{V}[k]\cdot \text{V}[k]

Both objects must be of equal size. If they are not, the method will return the dot product of the largest sub-array.

Examples

var a,b: Matrix;
prod: double;
begin
    a.SetIt(1,4,False,[1,2,3,4]);
    b.SetIt(1,4,False,[5,6,7,8]);
    prod := a.DotProd(b,0,0,4); // = 1*5 + 2*6 + * 3*7 + 4*8
end;

See Also: Matrix.DotProdc