Contents
zhemv - perform the matrix-vector operation y := alpha*A*x
+ beta*y
SUBROUTINE ZHEMV(UPLO, N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY)
CHARACTER * 1 UPLO
DOUBLE COMPLEX ALPHA, BETA
DOUBLE COMPLEX A(LDA,*), X(*), Y(*)
INTEGER N, LDA, INCX, INCY
SUBROUTINE ZHEMV_64(UPLO, N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY)
CHARACTER * 1 UPLO
DOUBLE COMPLEX ALPHA, BETA
DOUBLE COMPLEX A(LDA,*), X(*), Y(*)
INTEGER*8 N, LDA, INCX, INCY
F95 INTERFACE
SUBROUTINE HEMV(UPLO, [N], ALPHA, A, [LDA], X, [INCX], BETA, Y, [INCY])
CHARACTER(LEN=1) :: UPLO
COMPLEX(8) :: ALPHA, BETA
COMPLEX(8), DIMENSION(:) :: X, Y
COMPLEX(8), DIMENSION(:,:) :: A
INTEGER :: N, LDA, INCX, INCY
SUBROUTINE HEMV_64(UPLO, [N], ALPHA, A, [LDA], X, [INCX], BETA, Y,
[INCY])
CHARACTER(LEN=1) :: UPLO
COMPLEX(8) :: ALPHA, BETA
COMPLEX(8), DIMENSION(:) :: X, Y
COMPLEX(8), DIMENSION(:,:) :: A
INTEGER(8) :: N, LDA, INCX, INCY
C INTERFACE
#include <sunperf.h>
void zhemv(char uplo, int n, doublecomplex *alpha, doub-
lecomplex *a, int lda, doublecomplex *x, int incx,
doublecomplex *beta, doublecomplex *y, int incy);
void zhemv_64(char uplo, long n, doublecomplex *alpha, doub-
lecomplex *a, long lda, doublecomplex *x, long
incx, doublecomplex *beta, doublecomplex *y, long
incy);
zhemv performs the matrix-vector operation y := alpha*A*x +
beta*y where alpha and beta are scalars, x and y are n ele-
ment vectors and A is an n by n hermitian matrix.
UPLO (input)
On entry, UPLO specifies whether the upper or
lower triangular part of the array A is to be
referenced as follows:
UPLO = 'U' or 'u' Only the upper triangular part
of A is to be referenced.
UPLO = 'L' or 'l' Only the lower triangular part
of A is to be referenced.
Unchanged on exit.
N (input)
On entry, N specifies the order of the matrix A.
N >= 0. Unchanged on exit.
ALPHA (input)
On entry, ALPHA specifies the scalar alpha.
Unchanged on exit.
A (input)
Before entry with UPLO = 'U' or 'u', the leading
n by n upper triangular part of the array A must
contain the upper triangular part of the hermitian
matrix and the strictly lower triangular part of A
is not referenced. Before entry with UPLO = 'L'
or 'l', the leading n by n lower triangular part
of the array A must contain the lower triangular
part of the hermitian matrix and the strictly
upper triangular part of A is not referenced.
Note that the imaginary parts of the diagonal ele-
ments need not be set and are assumed to be zero.
Unchanged on exit.
LDA (input)
On entry, LDA specifies the first dimension of A
as declared in the calling (sub) program. LDA >=
max( 1, n ). Unchanged on exit.
X (input)
( 1 + ( n - 1 )*abs( INCX ) ). Before entry, the
incremented array X must contain the n element
vector x. Unchanged on exit.
INCX (input)
On entry, INCX specifies the increment for the
elements of X. INCX <> 0. Unchanged on exit.
BETA (input)
On entry, BETA specifies the scalar beta. When
BETA is supplied as zero then Y need not be set on
input. Unchanged on exit.
Y (input/output)
( 1 + ( n - 1 )*abs( INCY ) ). Before entry, the
incremented array Y must contain the n element
vector y. On exit, Y is overwritten by the updated
vector y.
INCY (input)
On entry, INCY specifies the increment for the
elements of Y. INCY <> 0. Unchanged on exit.