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RedHat 9 (Linux i386) - man page for sptts2 (redhat section l)

SPTTS2(l)					)					SPTTS2(l)

NAME
       SPTTS2  -  solve a tridiagonal system of the form A * X = B using the L*D*L' factorization
       of A computed by SPTTRF

SYNOPSIS
       SUBROUTINE SPTTS2( N, NRHS, D, E, B, LDB )

	   INTEGER	  LDB, N, NRHS

	   REAL 	  B( LDB, * ), D( * ), E( * )

PURPOSE
       SPTTS2 solves a tridiagonal system of the form A * X = B using the L*D*L' factorization of
       A  computed by SPTTRF. D is a diagonal matrix specified in the vector D, L is a unit bidi-
       agonal matrix whose subdiagonal 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) REAL array, dimension (N)
	       The n diagonal elements of the diagonal matrix D from the L*D*L' factorization  of
	       A.

       E       (input) REAL 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 bidi-
	       agonal factor U from the factorization A = U'*D*U.

       B       (input/output) REAL 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).

LAPACK version 3.0			   15 June 2000 				SPTTS2(l)


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