DSYCONV
November 2010
Purpose
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.
Get Non-diag elements of D (returned in workspace) and
apply or reverse permutation done in TRF.
Arguments
| UPLO |
(input) 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. |
| WAY |
(input) CHARACTER*1
= 'C': Convert
= 'R': Revert |
| N |
(input) INTEGER
The order of the matrix A. N >= 0.
|
| A |
(input) 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. |
| LDA |
(input) INTEGER
The leading dimension of the array A. LDA >= max(1,N).
|
| IPIV |
(input) INTEGER array, dimension (N)
Details of the interchanges and the block structure of D
as determined by DSYTRF. |
| WORK |
(workspace) DOUBLE PRECISION array, dimension (N)
|
| LWORK |
(input) INTEGER
The length of WORK. LWORK >=1.
LWORK = N If LWORK = -1, then a workspace query is assumed; the routine only calculates the optimal 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. |
| INFO |
(output) INTEGER
= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value |