TSparseMtx::Product Method

Overload List

#	Signature	Description
1	double Product();	Elements product.
2	double Product(int Index, int Len);	Returns the product for calling object elements [Index]..[Index+Len-1].
3	void Product(TCplx &X);	Calculate the product of all calling object complex elements.
4	void Product(TCplx &X, int Index, int Len);	Calculate the product for calling object complex elements [Index]..[Index+Len-1].
5	void Product(double &X);	Calculate the product of all calling object elements.
6	void Product(double &X, int Index, int Len);	Calculate the product for calling object elements [Index]..[Index+Len-1].

Overload 1: double Product();

Elements product.

Returns: the product of all calling object elements

Remarks:

X = \prod _{k=0} ^{\text{V.Length}-1} \text{V}[k]

An exception is raised if calling object TSparseMtx::Complex property is true.

Examples

#include "MtxVec.h"
#include "Units.MtxVec.h"

using namespace Dew;
using namespace Dew::Math;
using namespace Dew::Math::Units::MtxVec;

void Example()
{
    TVec* a;
    CreateIt(a);
    a->SetIt(false, DewArray<double>{1, 2, 3, 4});
    double c = a->Product(); // c= 24
    FreeIt(a);
}

#include "MtxExpr.h"
#include "Units.Math387.h"

using namespace Dew;
using namespace Dew::Math;
using namespace Dew::Math::Units::Math387;

void Example()
{
    Vector a;
    a.SetIt(DewArray<double>{ 1.0, 2.0, 3.0, 4.0 });
    double result = a.Product();
    if (Abs(result - 24.0) > 1e-10)
        throw tException(DewString("Vector.Product: expected 24.0, got ") + SampleToStr(result));
}

See Also: TSparseMtx::Productc