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ZPTTRS(l)					)					ZPTTRS(l)

NAME
       ZPTTRS  -  solve  a  tridiagonal  system of the form A * X = B using the factorization A =
       U'*D*U or A = L*D*L' computed by ZPTTRF

SYNOPSIS
       SUBROUTINE ZPTTRS( UPLO, N, NRHS, D, E, B, LDB, INFO )

	   CHARACTER	  UPLO

	   INTEGER	  INFO, LDB, N, NRHS

	   DOUBLE	  PRECISION D( * )

	   COMPLEX*16	  B( LDB, * ), E( * )

PURPOSE
       ZPTTRS solves a tridiagonal system of the form A * X =  B  using  the  factorization  A	=
       U'*D*U or A = L*D*L' computed by ZPTTRF. D is a diagonal matrix specified in the vector D,
       U (or L) is a unit bidiagonal matrix whose superdiagonal (subdiagonal) is specified in the
       vector E, and X and B are N by NRHS matrices.

ARGUMENTS
       UPLO    (input) CHARACTER*1
	       Specifies the form of the factorization and whether the vector E is the superdiag-
	       onal of the upper bidiagonal factor U or the subdiagonal of the	lower  bidiagonal
	       factor L.  = 'U':  A = U'*D*U, E is the superdiagonal of U
	       = 'L':  A = L*D*L', E is the subdiagonal of L

       N       (input) INTEGER
	       The order of the tridiagonal 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.

       D       (input) DOUBLE PRECISION array, dimension (N)
	       The n diagonal elements of the diagonal matrix D from the factorization A = U'*D*U
	       or A = L*D*L'.

       E       (input) COMPLEX*16 array, dimension (N-1)
	       If  UPLO  =  'U', the (n-1) superdiagonal elements of the unit bidiagonal factor U
	       from the factorization A = U'*D*U.  If UPLO = 'L', the (n-1) subdiagonal  elements
	       of the unit bidiagonal factor L from the factorization A = L*D*L'.

       B       (input/output) DOUBLE PRECISION array, dimension (LDB,NRHS)
	       On  entry,  the	right hand side vectors B for the system of linear equations.  On
	       exit, the solution vectors, X.

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

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

LAPACK version 3.0			   15 June 2000 				ZPTTRS(l)
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