SRC/zsptri.f(3)            Library Functions Manual            SRC/zsptri.f(3)

NAME
       SRC/zsptri.f

SYNOPSIS
   Functions/Subroutines
       subroutine zsptri (uplo, n, ap, ipiv, work, info)
           ZSPTRI

Function/Subroutine Documentation
   subroutine zsptri (character uplo, integer n, complex*16, dimension( * )
       ap, integer, dimension( * ) ipiv, complex*16, dimension( * ) work,
       integer info)
       ZSPTRI

       Purpose:


           !>
           !> ZSPTRI computes the inverse of a complex symmetric indefinite matrix
           !> A in packed storage using the factorization A = U*D*U**T or
           !> A = L*D*L**T computed by ZSPTRF.
           !>

       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.
           !>

           AP

           !>          AP is COMPLEX*16 array, dimension (N*(N+1)/2)
           !>          On entry, the block diagonal matrix D and the multipliers
           !>          used to obtain the factor U or L as computed by ZSPTRF,
           !>          stored as a packed triangular matrix.
           !>
           !>          On exit, if INFO = 0, the (symmetric) inverse of the original
           !>          matrix, stored as a packed triangular matrix. The j-th column
           !>          of inv(A) is stored in the array AP as follows:
           !>          if UPLO = 'U', AP(i + (j-1)*j/2) = inv(A)(i,j) for 1<=i<=j;
           !>          if UPLO = 'L',
           !>             AP(i + (j-1)*(2n-j)/2) = inv(A)(i,j) for j<=i<=n.
           !>

           IPIV

           !>          IPIV is INTEGER array, dimension (N)
           !>          Details of the interchanges and the block structure of D
           !>          as determined by ZSPTRF.
           !>

           WORK

           !>          WORK is COMPLEX*16 array, dimension (N)
           !>

           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 108 of file zsptri.f.

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

LAPACK                          Version 3.12.0                 SRC/zsptri.f(3)