F_SSPMV/F_DSPMV/F_CSPMV/F_ZSPMV

Symmetric packed matrix-vector multiply

 

INTEGER*8

INCX, INCY, N, UPLO

 

REAL*4

ALPHA, BETA

 

REAL*4

AP( * ), X( * ), Y( * )

 

SUBROUTINE F_SSPMV (UPLO, N, ALPHA, AP, X, INCX, BETA, Y, INCY)

 

INTEGER*8

INCX, INCY, N, UPLO

 

REAL*8

ALPHA, BETA

 

REAL*8

AP( * ), X( * ), Y( * )

 

SUBROUTINE F_DSPMV (UPLO, N, ALPHA, AP, X, INCX, BETA, Y,

 

INCY)

 

 

INTEGER*8

INCX, INCY, N, UPLO

 

COMPLEX*8

ALPHA, BETA

 

COMPLEX*8

AP( * ), X( * ), Y( * )

 

SUBROUTINE F_CSPMV (UPLO, N, ALPHA, AP, X, INCX, BETA, Y,

 

INCY)

 

 

INTEGER*8

INCX, INCY, N, UPLO

 

COMPLEX*16

ALPHA, BETA

 

COMPLEX*16

AP( * ), X( * ), Y( * )

 

SUBROUTINE F_ZSPMV (UPLO, N, ALPHA, AP, 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

REAL or COMPLEX scalar ALPHA.

 

AP

Array containing the upper or lower triangle, as

 

 

specified by uplo of an n-by-nreal symmetric or

 

 

complex Hermitian matrix A, stored by columns in

 

 

packed form.

 

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

REAL or COMPLEX scalar BETA.

 

Y

REAL or COMPLEX array, minimum length

 

 

(N - 1) x incy + 1.

382HP MLIB User’s Guide