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- CCCCSSSSPPPPRRRR((((3333FFFF)))) CCCCSSSSPPPPRRRR((((3333FFFF))))
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- NNNNAAAAMMMMEEEE
- CSPR - perform the symmetric rank 1 operation A := alpha*x*conjg( x' )
- + A,
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- SUBROUTINE CSPR( UPLO, N, ALPHA, X, INCX, AP )
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- CHARACTER UPLO
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- INTEGER INCX, N
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- COMPLEX ALPHA
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- COMPLEX AP( * ), X( * )
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- PPPPUUUURRRRPPPPOOOOSSSSEEEE
- CSPR performs the symmetric rank 1 operation
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- where alpha is a complex scalar, x is an n element vector 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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- 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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- 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. On exit, the array AP is
- overwritten by the upper triangular part of the updated matrix.
- 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. On exit, the array AP is overwritten by
- the lower triangular part of the updated matrix. Note that the
- imaginary parts of the diagonal elements need not be set, they are
- assumed to be zero, and on exit they are set to zero.
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- PPPPaaaaggggeeee 2222
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