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LAPACK 3.12.0
LAPACK: Linear Algebra PACKage
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subroutine ssytrs_aa | ( | character | uplo, |
integer | n, | ||
integer | nrhs, | ||
real, dimension( lda, * ) | a, | ||
integer | lda, | ||
integer, dimension( * ) | ipiv, | ||
real, dimension( ldb, * ) | b, | ||
integer | ldb, | ||
real, dimension( * ) | work, | ||
integer | lwork, | ||
integer | info | ||
) |
SSYTRS_AA
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SSYTRS_AA 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 SSYTRF_AA.
[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 REAL array, dimension (LDA,N) Details of factors computed by SSYTRF_AA. |
[in] | LDA | LDA is INTEGER The leading dimension of the array A. LDA >= max(1,N). |
[in] | IPIV | IPIV is INTEGER array, dimension (N) Details of the interchanges as computed by SSYTRF_AA. |
[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] | WORK | WORK is REAL array, dimension (MAX(1,LWORK)) |
[in] | LWORK | LWORK is INTEGER The dimension of the array WORK. If MIN(N,NRHS) = 0, LWORK >= 1, else LWORK >= 3*N-2. If LWORK = -1, then a workspace query is assumed; the routine only calculates the minimal size of the WORK array, returns this value as the first entry of the WORK array, and no error message related to LWORK is issued by XERBLA. |
[out] | INFO | INFO is INTEGER = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value |