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- CCCCSSSSPPPPMMMMVVVV((((3333FFFF)))) CCCCSSSSPPPPMMMMVVVV((((3333FFFF))))
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- NNNNAAAAMMMMEEEE
- CSPMV - perform the matrix-vector operation y := alpha*A*x + beta*y,
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- SUBROUTINE CSPMV( UPLO, N, ALPHA, AP, X, INCX, BETA, Y, INCY )
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- CHARACTER UPLO
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- INTEGER INCX, INCY, N
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- COMPLEX ALPHA, BETA
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- COMPLEX AP( * ), X( * ), Y( * )
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- PPPPUUUURRRRPPPPOOOOSSSSEEEE
- CSPMV performs the matrix-vector operation
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- 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.
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- 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:
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- UPLO = 'U' or 'u' The upper triangular part of A is supplied in
- AP.
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- UPLO = 'L' or 'l' The lower triangular part of A is supplied in
- AP.
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- Unchanged on exit.
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- N - INTEGER
- On entry, N specifies the order of the matrix A. N must be at
- least zero. Unchanged on exit.
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- ALPHA - COMPLEX
- On entry, ALPHA specifies the scalar alpha. Unchanged on exit.
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- AP - COMPLEX 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.
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- PPPPaaaaggggeeee 1111
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- X - COMPLEX 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.
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- INCX - INTEGER
- On entry, INCX specifies the increment for the elements of X. INCX
- must not be zero. Unchanged on exit.
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- BETA - COMPLEX
- On entry, BETA specifies the scalar beta. When BETA is supplied as
- zero then Y need not be set on input. Unchanged on exit.
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- Y - COMPLEX 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.
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- INCY - INTEGER
- On entry, INCY specifies the increment for the elements of Y. INCY
- must not be zero. Unchanged on exit.
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- PPPPaaaaggggeeee 2222
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