dsytrs_aa_2stage()

subroutine dsytrs_aa_2stage	(	character	UPLO,
		integer	N,
		integer	NRHS,
		double precision, dimension( lda, * )	A,
		integer	LDA,
		double precision, dimension( * )	TB,
		integer	LTB,
		integer, dimension( * )	IPIV,
		integer, dimension( * )	IPIV2,
		double precision, dimension( ldb, * )	B,
		integer	LDB,
		integer	INFO
	)

DSYTRS_AA_2STAGE

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Purpose:

 DSYTRS_AA_2STAGE solves a system of linear equations A*X = B with a real
 symmetric matrix A using the factorization A = U**T*T*U or
 A = L*T*L**T computed by DSYTRF_AA_2STAGE.

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**T*T*U; = 'L': Lower triangular, form is A = L*T*L**T.
[in]	N	N is INTEGER The order of the matrix A. N >= 0.
[in]	NRHS	NRHS is INTEGER The number of right hand sides, i.e., the number of columns of the matrix B. NRHS >= 0.
[in]	A	A is DOUBLE PRECISION array, dimension (LDA,N) Details of factors computed by DSYTRF_AA_2STAGE.
[in]	LDA	LDA is INTEGER The leading dimension of the array A. LDA >= max(1,N).
[out]	TB	TB is DOUBLE PRECISION array, dimension (LTB) Details of factors computed by DSYTRF_AA_2STAGE.
[in]	LTB	LTB is INTEGER The size of the array TB. LTB >= 4*N.
[in]	IPIV	IPIV is INTEGER array, dimension (N) Details of the interchanges as computed by DSYTRF_AA_2STAGE.
[in]	IPIV2	IPIV2 is INTEGER array, dimension (N) Details of the interchanges as computed by DSYTRF_AA_2STAGE.
[in,out]	B	B is DOUBLE PRECISION array, dimension (LDB,NRHS) On entry, the right hand side matrix B. On exit, the solution matrix X.
[in]	LDB	LDB is INTEGER The leading dimension of the array B. LDB >= max(1,N).
[out]	INFO	INFO is INTEGER = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.