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NAME
     csttrs - computes the solution to a complex system of linear
     equations A * X = B

SYNOPSIS
     SUBROUTINE CSTTRS(N, NRHS, L, D, SUBL, B, LDB, IPIV, INFO )

     INTEGER N, NRHS, LDB, IPIV( * ), INFO

     COMPLEX D( * ), L( * ), SUBL( * ), B( * )



     #include <sunperf.h>

     void csttrs(int n, int nrhs, complex *l, complex *d, complex
               *subl,  complex *b, int ldb, int *ipiv, int *info)
               ;

PURPOSE
     CSTTRS computes the solution to a complex system  of  linear
     equations A * X = B, where A is an N-by-N symmetric tridiag-
     onal matrix and X and B are N-by-NRHS matrices.


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

     NRHS      (input) INTEGER
               The number of right hand sides, i.e.,  the  number
               of columns of the matrix B. NRHS >= 0.

     L         (input) COMPLEX array, dimension (N-1)
               On entry, the subdiagonal elements of LL and DD.

     D         (input) COMPLEX array, dimension (N)
               On entry, the diagonal elements of DD.

     SUBL      (input) COMPLEX array, dimension (N-2)
               On entry, the second subdiagonal elements of LL.

     B         (input/output)  COMPLEX  array,  dimension   (LDB,
               NRHS)
               On entry, the N-by-NRHS right hand side matrix  B.
               On  exit,  if  INFO  =  0,  the N-by-NRHS solution
               matrix X.

     LDB       (input) INTEGER
               The leading dimension of  the  array  B.   LDB  >=
               max(1, N)

     IPIV      (output) INTEGER array, dimension (N)
               Details of the interchanges and block  pivot.   If
               IPIV(K)  > 0, 1 by 1 pivot, and if IPIV(K) = K + 1
               an interchange done;  If  IPIV(K)  <  0,  2  by  2
               pivot, no interchange required.

     INFO      (output) INTEGER
               = 0:  successful exit
               < 0:  if INFO = -k, the k-th argument had an ille-
               gal value

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