SRC/dsyconv.f(3)

NAME
SRC/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)

DSYCONV

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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