SRC/chetri2x.f(3)

NAME
SRC/chetri2x.f

SYNOPSIS

  Functions/Subroutines
subroutine chetri2x (uplo, n, a, lda, ipiv, work, nb, info)
CHETRI2X

Function/Subroutine Documentation

  subroutine chetri2x (character uplo, integer n, complex, dimension( lda, * ) a, integer lda, integer, dimension( * ) ipiv, complex, dimension( n+nb+1,* ) work, integer nb, integer info)

CHETRI2X

Purpose:

     CHETRI2X computes the inverse of a complex Hermitian indefinite matrix
     A using the factorization A = U*D*U**H or A = L*D*L**H computed by
     CHETRF.

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**H;
              = 'L':  Lower triangular, form is A = L*D*L**H.

    N

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

    A

              A is COMPLEX 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 CHETRF.
              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 CHETRF.

    WORK

              WORK is COMPLEX array, dimension (N+NB+1,NB+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.

Definition at line 119 of file chetri2x.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.