dsyconv.f(3)

NAME
dsyconv.f

SYNOPSIS

  Functions/Subroutines
subroutine dsyconv (UPLO, WAY, N, A, LDA, IPIV, E, INFO)
DSYCONV

Function/Subroutine Documentation

  subroutine dsyconv (character UPLO, character WAY, integer N, double precision, dimension( lda, * ) A, integer LDA, integer, dimension( * ) IPIV, double precision, dimension( * ) E, integer INFO)

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.

Parameters
    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

Author
    Univ. of Tennessee

    Univ. of California Berkeley

    Univ. of Colorado Denver

    NAG Ltd.

Definition at line 113 of file dsyconv.f.

Author

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