F_SSYMV/F_DSYMV/F_CSYMV/F_ZSYMV

Symmetric matrix-vector multiply

 

INTEGER*8

INCX, INCY, LDA, N, UPLO

 

REAL*8

ALPHA, BETA, A( LDA, * ), X( * ), Y( * )

 

SUBROUTINE F_DSYMV (UPLO, N, ALPHA, A, LDA, X, INCX, BETA, Y,

 

INCY)

 

 

INTEGER*8

INCX, INCY, LDA, N, UPLO

 

COMPLEX*8

ALPHA, BETA, A( LDA, * ), X( * ), Y( * )

 

SUBROUTINE F_CSYMV (UPLO, N, ALPHA, A, LDA, X, INCX, BETA, Y,

 

INCY)

 

 

INTEGER*8

INCX, INCY, LDA, N, UPLO

 

COMPLEX*16

ALPHA, BETA,A( LDA, * ), X( * ), Y( * )

 

SUBROUTINE F_ZSYMV (UPLO, N, ALPHA, A, LDA, X, INCX, BETA, Y,

 

INCY)

 

Input

UPLO

Specifies whether a triangular matrix is upper or lower

 

 

triangular. Use either BLAS_UPPER or BLAS_LOWER.

 

N

Number of columns in matrix A, n > 0. If n ≤ 0 , the

 

 

subprograms do not reference A, X, or Y.

 

ALPHA

The scalar ALPHA. If beta = 1 and alpha = 0, this

 

 

routine returns immediately.

 

A

REAL or COMPLEX array, dimension (LDA, N).

 

LDA

Leading dimension of array A. If lda < 1 or lda < n an

 

 

error condition is generated.

 

X

REAL or COMPLEX array, minimum length

 

 

(N - 1) x incx + 1.

 

INCX

Increment for the array x. A vector x having component

 

 

xi, i = 1,..., n, is stored in an array X() with increment

 

 

argument incx. If incx > 0 then xi is stored in

 

 

X (1 + (i - 1) x incx). If incx < 0 then xiis stored in

 

 

X (1 + (N - i) x incx). incx = 0 is an illegal value.

 

BETA

The scalar BETA. If beta = 1 and alpha = 0, this

 

 

routine returns immediately.

 

Y

REAL or COMPLEX array, minimum length

 

 

(N - 1) x incy + 1.

 

INCY

Increment for the array y. A vector y having component

 

 

yi, i = 1,..., n, is stored in an array Y() with increment

 

 

argument incy. If incy > 0 then yiis stored in

 

 

Y(1 + (i - 1) x incy). If incy < 0 then yi is stored in

 

 

Y(1 + (N - i) x incy). incy = 0 is an illegal value.

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