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DPTTS2(3S)							    DPTTS2(3S)

NAME
     DPTTS2 - solve a tridiagonal system of the form A * X = B using the
     L*D*L' factorization of A computed by DPTTRF

SYNOPSIS
     SUBROUTINE DPTTS2( N, NRHS, D, E, B, LDB )

	 INTEGER	LDB, N, NRHS

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

IMPLEMENTATION
     These routines are part of the SCSL Scientific Library and can be loaded
     using either the -lscs or the -lscs_mp option.  The -lscs_mp option
     directs the linker to use the multi-processor version of the library.

     When linking to SCSL with -lscs or -lscs_mp, the default integer size is
     4 bytes (32 bits). Another version of SCSL is available in which integers
     are 8 bytes (64 bits).  This version allows the user access to larger
     memory sizes and helps when porting legacy Cray codes.  It can be loaded
     by using the -lscs_i8 option or the -lscs_i8_mp option. A program may use
     only one of the two versions; 4-byte integer and 8-byte integer library
     calls cannot be mixed.

PURPOSE
     DPTTS2 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 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) 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
	     factorization 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 linear
	     equations.	 On exit, the solution vectors, X.

									Page 1

DPTTS2(3S)							    DPTTS2(3S)

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

SEE ALSO
     INTRO_LAPACK(3S), INTRO_SCSL(3S)

     This man page is available only online.

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