zsytri2x.f(3)

NAME
zsytri2x.f -

SYNOPSIS

  Functions/Subroutines
subroutine ZSYTRI2X (UPLO, N, A, LDA, IPIV, WORK, NB, INFO)
ZSYTRI2X

Function/Subroutine Documentation

  subroutine ZSYTRI2X (CHARACTERUPLO, INTEGERN, COMPLEX*16, dimension( lda, * )A, INTEGERLDA, INTEGER, dimension( * )IPIV, COMPLEX*16, dimension( n+nb+1,* )WORK, INTEGERNB, INTEGERINFO)

ZSYTRI2X

Purpose:

     ZSYTRI2X computes the inverse of a complex symmetric indefinite matrix
     A using the factorization A = U*D*U**T or A = L*D*L**T computed by
     ZSYTRF.

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.

    N

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

    A

              A is COMPLEX*16 array, dimension (LDA,N)
              On entry, the NNB diagonal matrix D and the multipliers
              used to obtain the factor U or L as computed by ZSYTRF.
              On exit, if INFO = 0, the (symmetric) inverse of the original
              matrix.  If UPLO = 'U', the upper triangular part of the
              inverse is formed and the part of A below the diagonal is not
              referenced; if UPLO = 'L' the lower triangular part of the
              inverse is formed and the part of A above the diagonal is
              not referenced.

    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 NNB structure of D
              as determined by ZSYTRF.

    WORK

              WORK is COMPLEX*16 array, dimension (N+NNB+1,NNB+3)

    NB

              NB is INTEGER
              Block size

    INFO

              INFO is INTEGER
              = 0: successful exit
              < 0: if INFO = -i, the i-th argument had an illegal value
              > 0: if INFO = i, D(i,i) = 0; the matrix is singular and its
                   inverse could not be computed.

Author:
    Univ'. of Tennessee

    Univ'. of California Berkeley

    Univ'. of Colorado Denver

    NAG Ltd'.

Date:
    November 2011

Definition at line 121 of file zsytri2x.f'.

Author

Generated automatically by Doxygen for LAPACK from the source code'.