cblas_?hemv
cblas_?hemv
Computes a matrix-vector product using a Hermitian matrix.
Syntax
void
cblas_chemv
(
const
CBLAS_LAYOUT
Layout
,
const
CBLAS_UPLO
uplo
,
const
MKL_INT
n
,
const
void
*alpha
,
const
void
*a
,
const
MKL_INT
lda
,
const
void
*x
,
const
MKL_INT
incx
,
const
void
*beta
,
void
*y
,
const
MKL_INT
incy
);
void
cblas_zhemv
(
const
CBLAS_LAYOUT
Layout
,
const
CBLAS_UPLO
uplo
,
const
MKL_INT
n
,
const
void
*alpha
,
const
void
*a
,
const
MKL_INT
lda
,
const
void
*x
,
const
MKL_INT
incx
,
const
void
*beta
,
void
*y
,
const
MKL_INT
incy
);
Include Files
- mkl.h
Description
The
?hemv
routines perform a matrix-vector operation defined as y := alpha*A*x + beta*y,
where:
alpha
and beta
are scalars,x
and y
are n
-element vectors,A
is an n
-by-n
Hermitian matrix.Input Parameters
- Layout
- Specifies whether two-dimensional array storage is row-major (CblasRowMajor) or column-major (CblasColMajor).
- uplo
- Specifies whether the upper or lower triangular part of the arrayais used.If, then the upper triangular of the arrayuplo=CblasUpperais used.If, then the low triangular of the arrayuplo=CblasLowerais used.
- n
- Specifies the order of the matrixA. The value ofnmust be at least zero.
- alpha
- Specifies the scalaralpha.
- a
- Array, size.lda*nBefore entry with, the leadinguplo=CblasUppern-by-nupper triangular part of the arrayamust contain the upper triangular part of the Hermitian matrix and the strictly lower triangular part ofais not referenced. Before entry with, the leadinguplo=CblasLowern-by-nlower triangular part of the arrayamust contain the lower triangular part of the Hermitian matrix and the strictly upper triangular part ofais not referenced.The imaginary parts of the diagonal elements need not be set and are assumed to be zero.
- lda
- Specifies the leading dimension ofaas declared in the calling (sub)program. The value ofldamust be at leastmax(1,.n)
- x
- Array, size at least(1 + (. Before entry, the incremented arrayn- 1)*abs(incx))xmust contain then-element vectorx.
- incx
- Specifies the increment for the elements ofx.The value ofincxmust not be zero.
- beta
- Specifies the scalarbeta. Whenbetais supplied as zero thenyneed not be set on input.
- y
- Array, size at least(1 + (. Before entry, the incremented arrayn- 1)*abs(incy))ymust contain then-element vectory.
- incy
- Specifies the increment for the elements ofy.The value ofincymust not be zero.
Output Parameters
- y
- Overwritten by the updated vectory.