VDmath Namespace Reference

Functions
template<class T >
T	Ddot2 (Nektar::LibUtilities::CommSharedPtr &pComm, int n, const T *w, const T *x, const int *y)
	vvtvp (vector times vector times vector): z = w*x*y More...
template<class T >
T	Ddot2 (Nektar::LibUtilities::CommSharedPtr &pComm, int n, const T *w, const int incw, const T *x, const int incx, const int *y, const int incy)
	vvtvp (vector times vector times vector): z = w*x*y More...
template<class T >
T	Ddot2 (LibUtilities::CommSharedPtr &pComm, int n, const Array< OneD, const T > &w, const Array< OneD, const T > &x, const Array< OneD, const int > &y)
template<class T >
T	Ddot2 (LibUtilities::CommSharedPtr &pComm, int n, const Array< OneD, const T > &w, const int incw, const Array< OneD, const T > &x, const int incx, const Array< OneD, const int > &y, const int incy)

Function Documentation

Ddot2() [1/4]

template<class T >

T VDmath::Ddot2	(	Nektar::LibUtilities::CommSharedPtr &	pComm,
		int	n,
		const T *	w,
		const T *	x,
		const int *	y
	)

vvtvp (vector times vector times vector): z = w*x*y

Definition at line 44 of file VDmath.hpp.

References Nektar::LibUtilities::ReduceSum.

Referenced by Ddot2().

    {
        T sum = 0;

        while( n-- )
        {
            sum += (*y == 1 ? (*w) * (*x) : 0 );
            ++w;
            ++x;
            ++y;
        }
        pComm->AllReduce(sum, Nektar::LibUtilities::ReduceSum);
        return sum;
    }

Ddot2() [2/4]

template<class T >

T VDmath::Ddot2	(	LibUtilities::CommSharedPtr &	pComm,
		int	n,
		const Array< OneD, const T > &	w,
		const Array< OneD, const T > &	x,
		const Array< OneD, const int > &	y
	)

Definition at line 48 of file VDmathArray.hpp.

References ASSERTL1, and Ddot2().

    {
        ASSERTL1(n <= w.num_elements()+w.GetOffset(),"Array out of bounds");
        ASSERTL1(n <= x.num_elements()+x.GetOffset(),"Array out of bounds");
        ASSERTL1(n <= y.num_elements()+y.GetOffset(),"Array out of bounds");

        return Ddot2(pComm, n,&w[0],&x[0],&y[0]);
    }

Ddot2() [3/4]

template<class T >

T VDmath::Ddot2	(	LibUtilities::CommSharedPtr &	pComm,
		int	n,
		const Array< OneD, const T > &	w,
		const int	incw,
		const Array< OneD, const T > &	x,
		const int	incx,
		const Array< OneD, const int > &	y,
		const int	incy
	)

Definition at line 61 of file VDmathArray.hpp.

References ASSERTL1, and Ddot2().

    {
        ASSERTL1(n*incw <= w.num_elements()+w.GetOffset(),"Array out of bounds");
        ASSERTL1(n*incx <= x.num_elements()+x.GetOffset(),"Array out of bounds");
        ASSERTL1(n*incy <= y.num_elements()+y.GetOffset(),"Array out of bounds");

        return Ddot2(pComm, n,&w[0],incw,&x[0],incx,&y[0],incy);
    }

Ddot2() [4/4]

template<class T >

T VDmath::Ddot2	(	Nektar::LibUtilities::CommSharedPtr &	pComm,
		int	n,
		const T *	w,
		const int	incw,
		const T *	x,
		const int	incx,
		const int *	y,
		const int	incy
	)

vvtvp (vector times vector times vector): z = w*x*y

Definition at line 64 of file VDmath.hpp.

References Nektar::LibUtilities::ReduceSum.

    {
        T sum = 0;

        while( n-- )
        {
            sum += (*y == 1 ? (*w) * (*x) : 0.0 );
            w += incw;
            x += incx;
            y += incy;
        }
        pComm->AllReduce(sum, Nektar::LibUtilities::ReduceSum);
        return sum;
    }