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DPTTRS(l)			       )			     DPTTRS(l)

NAME
       DPTTRS  -  solve	 a  tridiagonal system of the form A * X = B using the
       L*D*L' factorization of A computed by DPTTRF

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

	   INTEGER	  INFO, LDB, N, NRHS

	   DOUBLE	  PRECISION B( LDB, * ), D( * ), E( * )

PURPOSE
       DPTTRS solves a tridiagonal system of the form A *  X  =	 B  using  the
       L*D*L'  factorization  of  A computed by DPTTRF. D is a diagonal matrix
       specified in the vector D, L is a unit bidiagonal matrix whose subdiag‐
       onal is specified in the vector E, and X and B are N by NRHS matrices.

ARGUMENTS
       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
	       L*D*L' factorization of A.

       E       (input) DOUBLE PRECISION array, dimension (N-1)
	       The  (n-1) subdiagonal elements of the unit bidiagonal factor L
	       from the L*D*L' factorization of A.  E can also be regarded  as
	       the superdiagonal of the unit bidiagonal factor U from the fac‐
	       torization A = U'*D*U.

       B       (input/output) DOUBLE PRECISION array, dimension (LDB,NRHS)
	       On entry, the right hand side vectors B for the system of  lin‐
	       ear 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			     DPTTRS(l)
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