(S|D)SPMV¶

Single and double SPMV.

Description¶

Computes the symmetric packed matrix-vector operation:

$y \assign \alpha A * x + \beta y$

BLAS Interface¶

void sspmv(const char *UPLO, const qml_long *N, const float *ALPHA,
           const float *AP, const float *X, const qml_long *INCX,
           const float *BETA, float *Y, const qml_long *INCY);

void dspmv(const char *UPLO, const qml_long *N, const double *ALPHA,
           const double *AP, const double *X, const qml_long *INCX,
           const double *BETA, double *Y, const qml_long *INCY);

CBLAS Interface¶

void cblas_sspmv(const CBLAS_ORDER ORDER, const CBLAS_UPLO UPLO, const qml_long N,
                 const float ALPHA, const float *AP, const float *X,
                 const qml_long INCX, const float BETA, float *Y,
                 const qml_long INCY);

void cblas_dspmv(const CBLAS_ORDER ORDER, const CBLAS_UPLO UPLO, const qml_long N,
                 const double ALPHA, const double *AP, const double *X,
                 const qml_long INCX, const double BETA, double *Y,
                 const qml_long INCY);

Arguments¶

UPLO	Specify whether the upper or lower triangle of matrix A will be used
N	Order of matrix A
ALPHA	Scalar multiplied with the matrix-vector product
AP	Matrix A stored in packed triangular form, must be at least: $\fvar{N}\mult(\fvar{N}+1)/2$
ALPHA	Scalar multiplied with the matrix-vector product
X	First input vector, must be at least: $(\fvar{N}-1)\mult\abs{\fvar{INCX}} + 1$
INCX	Distance between individual elements in X
BETA	Scalar multiplied with vector Y
Y	Second vector, must be at least: $(\fvar{M}-1)\mult\abs{\fvar{INCY}} + 1$
INCY	Distance between individual elements in Y