sgetrs()

subroutine sgetrs	(	character	trans,
		integer	n,
		integer	nrhs,
		real, dimension( lda, * )	a,
		integer	lda,
		integer, dimension( * )	ipiv,
		real, dimension( ldb, * )	b,
		integer	ldb,
		integer	info )

SGETRS

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Purpose:

!>
!> SGETRS solves a system of linear equations
!>    A * X = B  or  A**T * X = B
!> with a general N-by-N matrix A using the LU factorization computed
!> by SGETRF.
!> 

Parameters

[in]	TRANS	!> TRANS is CHARACTER*1 !> Specifies the form of the system of equations: !> = 'N': A * X = B (No transpose) !> = 'T': A**T* X = B (Transpose) !> = 'C': A**T* X = B (Conjugate transpose = Transpose) !>
[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 REAL array, dimension (LDA,N) !> The factors L and U from the factorization A = P*L*U !> as computed by SGETRF. !>
[in]	LDA	!> LDA is INTEGER !> The leading dimension of the array A. LDA >= max(1,N). !>
[in]	IPIV	!> IPIV is INTEGER array, dimension (N) !> The pivot indices from SGETRF; for 1<=i<=N, row i of the !> matrix was interchanged with row IPIV(i). !>
[in,out]	B	!> B is REAL 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.