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NAME
     zsttrf - compute the factorization of  a  complex  Hermitian
     tridiagonal matrix A

SYNOPSIS
     SUBROUTINE ZSTTRF( N, L, D, SUBL, IPIV, INFO )

     INTEGER INFO, N

     DOUBLE PRECISION D( * )

     DOUBLE COMPLEX L( * ), SUBL( * )



     #include <sunperf.h>

     void zsttrf(int n, doublecomplex *l, double  *d,  doublecom-
               plex *subl, int *info) ;

PURPOSE
     ZSTTRF computes the factorization  of  a  complex  Hermitian
     tridiagonal matrix A.


ARGUMENTS
     N         (input) INTEGER
               The order of the matrix A.  N >= 0.

     L         (input/output) COMPLEX*16 array, dimension (N)
               On entry, the n-1 subdiagonal elements of the tri-
               diagonal  matrix A.  On exit, part of the factori-
               zation of A.

     D         (input/output) DOUBLE PRECISION  array,  dimension
               (N)
               On entry, the n diagonal elements of the tridiago-
               nal matrix A.  On exit, the n diagonal elements of
               the diagonal matrix D from the L*D*L**H factoriza-
               tion of A.

     SUBL      (output) COMPLEX*16 array, dimension (N)
               On exit, part of the factorization of A.

     IPIV      (output) INTEGER array, dimension (N)
               On exit, the pivot indices of the factorization.

     INFO      (output) INTEGER
               = 0:  successful exit
               < 0:  if INFO = -i, the i-th argument had an ille-
               gal value
               > 0:  if INFO = i, D(k,k) is  exactly  zero.   The
               factorization  has  been  completed, but the block
               diagonal matrix D is exactly singular and division
               by zero will occur if it is used to solve a system
               of equations.

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