zhetri2x.f man page

zhetri2x.f

Synopsis

Functions/Subroutines

subroutine zhetri2x (UPLO, N, A, LDA, IPIV, WORK, NB, INFO)
ZHETRI2X

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)

ZHETRI2X  

Purpose:

 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
 ZHETRF.
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*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

          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 ZHETRF.

WORK

          WORK is COMPLEX*16 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.

Date:

June 2017

Definition at line 122 of file zhetri2x.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.

Referenced By

The man page zhetri2x(3) is an alias of zhetri2x.f(3).

Tue Nov 14 2017 Version 3.8.0 LAPACK