LAPACK  3.4.2
LAPACK: Linear Algebra PACKage
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zhetri2x.f File Reference

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subroutine zhetri2x (UPLO, N, A, LDA, IPIV, WORK, NB, INFO)

Function/Subroutine Documentation

subroutine zhetri2x ( character  UPLO,
integer  N,
complex*16, dimension( lda, * )  A,
integer  LDA,
integer, dimension( * )  IPIV,
complex*16, dimension( n+nb+1,* )  WORK,
integer  NB,
integer  INFO 


Download ZHETRI2X + dependencies [TGZ] [ZIP] [TXT]
 ZHETRI2X computes the inverse of a COMPLEX*16 Hermitian indefinite matrix
 A using the factorization A = U*D*U**H or A = L*D*L**H computed by
          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 is INTEGER
          The order of the matrix A.  N >= 0.
          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 ZHETRF.

          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 is INTEGER
          The leading dimension of the array A.  LDA >= max(1,N).
          IPIV is INTEGER array, dimension (N)
          Details of the interchanges and the NNB structure of D
          as determined by ZHETRF.
          WORK is COMPLEX*16 array, dimension (N+NNB+1,NNB+3)
          NB is INTEGER
          Block size
          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.
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
November 2011

Definition at line 121 of file zhetri2x.f.

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