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.

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.

WAY

          WAY is CHARACTER*1


          = 'C': Convert


          = 'R': Revert

N

          N is INTEGER


          The order of the matrix A.  N >= 0.

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.

LDA

          LDA is INTEGER


          The leading dimension of the array A.  LDA >= max(1,N).

IPIV

          IPIV is INTEGER array, dimension (N)


          Details of the interchanges and the block structure of D


          as determined by DSYTRF.

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.

INFO

          INFO is INTEGER


          = 0:  successful exit


          < 0:  if INFO = -i, the i-th argument had an illegal value

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

December 2016