Matrix::DotProd Method

double DotProd(TMtxVec *Vec, int VecIndex, int Index, int Len) const;

Scalar product of two real arrays.

#	Name	Type
1	Vec	TMtxVec *
2	VecIndex	int
3	Index	int
4	Len	int

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

#include "MtxExpr.h"

using namespace Dew;
using namespace Dew::Math;

void Example()
{
    Matrix a, b;
    double prod;

    a.SetIt(1, 4, false, DewArray<double>{1, 2, 3, 4});
    b.SetIt(1, 4, false, DewArray<double>{5, 6, 7, 8});
    prod = a.DotProd(b, 0, 0, 4); // = 1*5 + 2*6 + * 3*7 + 4*8
}

See Also: Matrix::DotProdc

Declared in Dew::Math::Matrix · Dew.Math/MtxExpr.h · Cross-compiler