ssyswapr()

subroutine ssyswapr	(	character	UPLO,
		integer	N,
		real, dimension( lda, * )	A,
		integer	LDA,
		integer	I1,
		integer	I2
	)

SSYSWAPR applies an elementary permutation on the rows and columns of a symmetric matrix.

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Purpose:

 SSYSWAPR applies an elementary permutation on the rows and the columns of
 a symmetric matrix.

Parameters

[in]	UPLO	UPLO is CHARACTER*1 Specifies whether the details of the factorization are stored as an upper or lower triangular matrix. = 'U': Upper triangular, form is A = U*D*U**T; = 'L': Lower triangular, form is A = L*D*L**T.
[in]	N	N is INTEGER The order of the matrix A. N >= 0.
[in,out]	A	A is REAL array, dimension (LDA,*) On entry, the N-by-N matrix A. On exit, the permuted matrix where the rows I1 and I2 and columns I1 and I2 are interchanged. If UPLO = 'U', the interchanges are applied to the upper triangular part and the strictly lower triangular part of A is not referenced; if UPLO = 'L', the interchanges are applied to the lower triangular part and the part of A above the diagonal is not referenced.
[in]	LDA	LDA is INTEGER The leading dimension of the array A. LDA >= max(1,N).
[in]	I1	I1 is INTEGER Index of the first row to swap
[in]	I2	I2 is INTEGER Index of the second row to swap

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.