chetrs_aa_2stage()

subroutine chetrs_aa_2stage	(	character	uplo,
		integer	n,
		integer	nrhs,
		complex, dimension( lda, * )	a,
		integer	lda,
		complex, dimension( * )	tb,
		integer	ltb,
		integer, dimension( * )	ipiv,
		integer, dimension( * )	ipiv2,
		complex, dimension( ldb, * )	b,
		integer	ldb,
		integer	info )

CHETRS_AA_2STAGE

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Purpose:

!>
!> CHETRS_AA_2STAGE solves a system of linear equations A*X = B with a real
!> hermitian matrix A using the factorization A = U**T*T*U or
!> A = L*T*L**T computed by CHETRF_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 COMPLEX array, dimension (LDA,N) !> Details of factors computed by CHETRF_AA_2STAGE. !>
[in]	LDA	!> LDA is INTEGER !> The leading dimension of the array A. LDA >= max(1,N). !>
[out]	TB	!> TB is COMPLEX array, dimension (LTB) !> Details of factors computed by CHETRF_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 !> CHETRF_AA_2STAGE. !>
[in]	IPIV2	!> IPIV2 is INTEGER array, dimension (N) !> Details of the interchanges as computed by !> CHETRF_AA_2STAGE. !>
[in,out]	B	!> B is COMPLEX 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.