Function

cblas_dsymv

Scales a symmetric matrix, multiplies by a vector, then scales and adds another vector (single precision).

Declaration

void cblas_dsymv(const enum CBLAS_ORDER __Order, const enum CBLAS_UPLO __Uplo, const int __N, const double __alpha, const double *__A, const int __lda, const double *__X, const int __incX, const double __beta, double *__Y, const int __incY);

Parameters

Order

Specifies row-major (C) or column-major (Fortran) data ordering.

Uplo

Specifies whether to use the upper or lower triangle from the matrix. Valid values are 'U' or 'L'.

N

Order of matrix A; length of vectors.

alpha

Scaling factor for matrix A.

A

Matrix A.

lda

Leading dimension of array containing matrix A.

X

Vector x.

incX

Stride within X. For example, if incX is 7, every 7th element is used.

beta

Scaling factor for vector y.

Y

Vector y. Contains results on return.

incY

Stride within Y. For example, if incY is 7, every 7th element is used.

Discussion

Computes alpha*A*x + beta*y and stores the results in Y.

See Also

Double-Precision Float Matrix Functions

cblas_dasum

Computes the sum of the absolute values of elements in a vector (double-precision).

cblas_daxpy

Computes a constant times a vector plus a vector (double-precision).

cblas_dcopy

Copies a vector to another vector (double-precision).

cblas_dgbmv

Scales a general band matrix, then multiplies by a vector, then adds a vector (double precision).

cblas_dgemm

Multiplies two matrices (double-precision).

cblas_dgemv

Multiplies a matrix by a vector (double precision).

cblas_dger

Multiplies vector X by the transpose of vector Y, then adds matrix A (double precison).

cblas_dnrm2

Computes the L2 norm (Euclidian length) of a vector (double precision).

cblas_drot

Applies a Givens rotation matrix to a pair of vectors.

cblas_drotg

Constructs a Givens rotation matrix.

cblas_drotm

Applies a modified Givens transformation (single precision).

cblas_drotmg

Generates a modified Givens rotation matrix.

cblas_dsbmv

Scales a symmetric band matrix, then multiplies by a vector, then adds a vector (double precision).

cblas_dscal

Multiplies each element of a vector by a constant (double-precision).

cblas_dspmv

Scales a packed symmetric matrix, then multiplies by a vector, then scales and adds another vector (double precision).

cblas_dspr

Rank one update: adds a packed symmetric matrix to the product of a scaling factor, a vector, and its transpose (double precision).

cblas_dspr2

Rank two update of a packed symmetric matrix using two vectors (single precision).

cblas_dswap

Exchanges the elements of two vectors (double precision).

cblas_dsymm

Multiplies a matrix by a symmetric matrix (double-precision).

cblas_dsyr

Rank one update: adds a symmetric matrix to the product of a scaling factor, a vector, and its transpose (double precision).

cblas_dsyr2

Rank two update of a symmetric matrix using two vectors (single precision).

cblas_dsyr2k

Performs a rank-2k update of a symmetric matrix (double precision).

cblas_dsyrk

Rank-k update—multiplies a symmetric matrix by its transpose and adds a second matrix (double precision).

cblas_dtbmv

Scales a triangular band matrix, then multiplies by a vector (double precision).

cblas_dtbsv

Solves a triangular banded system of equations.

cblas_dtpmv

Multiplies a triangular matrix by a vector, then adds a vector (double precision).

cblas_dtpsv

Solves a packed triangular system of equations.

cblas_dtrmm

Scales a triangular matrix and multiplies it by a matrix.

cblas_dtrmv

Multiplies a triangular matrix by a vector.

cblas_dtrsm

Solves a triangular system of equations with multiple values for the right side.

cblas_dtrsv

Solves a triangular system of equations with a single value for the right side.