ZSYCONV
May 2010
Purpose
ZSYCONV converts A given by ZHETRF into L and D or vice-versa.
Get nondiagonal elements of D (returned in workspace) and
apply or reverse permutation done in TRF.
Get nondiagonal 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 COMPLEX array, dimension (LDA,N)
The block diagonal matrix D and the multipliers used to
obtain the factor U or L as computed by ZSYTRF. |
| 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 ZSYTRF. |
| WORK |
(workspace) DOUBLE COMPLEX 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 |