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IRIX 6.2 Development Libraries
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zspmv.z
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zspmv
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1996-03-14
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4KB
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133 lines
ZZZZSSSSPPPPMMMMVVVV((((3333FFFF)))) ZZZZSSSSPPPPMMMMVVVV((((3333FFFF))))
NNNNAAAAMMMMEEEE
ZSPMV - perform the matrix-vector operation y := alpha*A*x + beta*y,
SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
SUBROUTINE ZSPMV( UPLO, N, ALPHA, AP, X, INCX, BETA, Y, INCY )
CHARACTER UPLO
INTEGER INCX, INCY, N
COMPLEX*16 ALPHA, BETA
COMPLEX*16 AP( * ), X( * ), Y( * )
PPPPUUUURRRRPPPPOOOOSSSSEEEE
ZSPMV performs the matrix-vector operation
where alpha and beta are scalars, x and y are n element vectors and A is
an n by n symmetric matrix, supplied in packed form.
AAAARRRRGGGGUUUUMMMMEEEENNNNTTTTSSSS
UPLO - CHARACTER*1
On entry, UPLO specifies whether the upper or lower triangular
part of the matrix A is supplied in the packed array AP as
follows:
UPLO = 'U' or 'u' The upper triangular part of A is supplied in
AP.
UPLO = 'L' or 'l' The lower triangular part of A is supplied in
AP.
Unchanged on exit.
N - INTEGER
On entry, N specifies the order of the matrix A. N must be at
least zero. Unchanged on exit.
ALPHA - COMPLEX*16
On entry, ALPHA specifies the scalar alpha. Unchanged on exit.
AP - COMPLEX*16 array, dimension at least
( ( N*( N + 1 ) )/2 ). Before entry, with UPLO = 'U' or 'u', the
array AP must contain the upper triangular part of the symmetric
matrix packed sequentially, column by column, so that AP( 1 )
contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 1, 2 ) and a(
2, 2 ) respectively, and so on. Before entry, with UPLO = 'L' or
'l', the array AP must contain the lower triangular part of the
symmetric matrix packed sequentially, column by column, so that
AP( 1 ) contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 2, 1 )
and a( 3, 1 ) respectively, and so on. Unchanged on exit.
PPPPaaaaggggeeee 1111
ZZZZSSSSPPPPMMMMVVVV((((3333FFFF)))) ZZZZSSSSPPPPMMMMVVVV((((3333FFFF))))
X - COMPLEX*16 array, dimension at least
( 1 + ( N - 1 )*abs( INCX ) ). Before entry, the incremented
array X must contain the N- element vector x. Unchanged on exit.
INCX - INTEGER
On entry, INCX specifies the increment for the elements of X. INCX
must not be zero. Unchanged on exit.
BETA - COMPLEX*16
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 - COMPLEX*16 array, dimension at least
( 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 - INTEGER
On entry, INCY specifies the increment for the elements of Y. INCY
must not be zero. Unchanged on exit.
PPPPaaaaggggeeee 2222