LAPACK
3.6.1
LAPACK: Linear Algebra PACKage
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subroutine dsyconv | ( | character | UPLO, |
character | WAY, | ||
integer | N, | ||
double precision, dimension( lda, * ) | A, | ||
integer | LDA, | ||
integer, dimension( * ) | IPIV, | ||
double precision, dimension( * ) | E, | ||
integer | INFO | ||
) |
DSYCONV
Download DSYCONV + dependencies [TGZ] [ZIP] [TXT]
DSYCONV convert A given by TRF into L and D and vice-versa. Get Non-diag elements of D (returned in workspace) and apply or reverse permutation done in TRF.
[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] | WAY | WAY is CHARACTER*1 = 'C': Convert = 'R': Revert |
[in] | N | N is INTEGER The order of the matrix A. N >= 0. |
[in,out] | A | A is DOUBLE PRECISION array, dimension (LDA,N) The block diagonal matrix D and the multipliers used to obtain the factor U or L as computed by DSYTRF. |
[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 and the block structure of D as determined by DSYTRF. |
[out] | E | E is DOUBLE PRECISION array, dimension (N) E stores the supdiagonal/subdiagonal of the symmetric 1-by-1 or 2-by-2 block diagonal matrix D in LDLT. |
[out] | INFO | INFO is INTEGER = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value |
Definition at line 116 of file dsyconv.f.