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

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

     INTEGER INFO, N

     REAL D( * )

     COMPLEX L( * ), SUBL( * )



     #include <sunperf.h>

     void csttrf(int n, complex *l, float *d, complex *subl,  int
               *info) ;

PURPOSE
     CSTTRF computes the L*D*L**H factorization of a complex Her-
     mitian tridiagonal matrix A.


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

     L         (input/output) COMPLEX 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) REAL 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 factorization of A.

     SUBL      (output) COMPLEX 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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