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NAME
     sstsv - compute the solution to a system of linear equations
     A * X = B where A is a symmetric tridiagonal matrix

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

     INTEGER INFO, N

     REAL D( * )

     REAL L( * ), SUBL( * )



     #include <sunperf.h>

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

PURPOSE
     SSTSV computes the solution to a system of linear  equations
     A * X = B where A is a symmetric tridiagonal matrix.


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

     L         (input/output) REAL 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) REAL 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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