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- CSYR - perform the symmetric rank 1 operation A := alpha*x*( x' ) + A,
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- SUBROUTINE CSYR( UPLO, N, ALPHA, X, INCX, A, LDA )
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- CHARACTER UPLO
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- INTEGER INCX, LDA, N
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- COMPLEX ALPHA
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- COMPLEX A( LDA, * ), X( * )
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- PPPPUUUURRRRPPPPOOOOSSSSEEEE
- CSYR 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.
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- UPLO - CHARACTER*1
- On entry, UPLO specifies whether the upper or lower triangular
- part of the array A is to be referenced as follows:
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- UPLO = 'U' or 'u' Only the upper triangular part of A is to be
- referenced.
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- UPLO = 'L' or 'l' Only the lower triangular part of A is to be
- referenced.
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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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- A - COMPLEX array, dimension ( LDA, N )
- Before entry, with UPLO = 'U' or 'u', the leading n by n upper
- triangular part of the array A must contain the upper triangular
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- part of the symmetric matrix and the strictly lower triangular
- part of A is not referenced. On exit, the upper triangular part of
- the array A is overwritten by the upper triangular part of the
- updated matrix. Before entry, with UPLO = 'L' or 'l', the leading
- n by n lower triangular part of the array A must contain the lower
- triangular part of the symmetric matrix and the strictly upper
- triangular part of A is not referenced. On exit, the lower
- triangular part of the array A is overwritten by the lower
- triangular part of the updated matrix.
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- LDA - INTEGER
- On entry, LDA specifies the first dimension of A as declared in
- the calling (sub) program. LDA must be at least max( 1, N ).
- Unchanged on exit.
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