dpttrs(l) [redhat man page]

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 subdiagonal is specified in the vector E, and X and B are N by  NRHS  matri-
       ces.

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.

       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)

dpttrs.f(3)							      LAPACK							       dpttrs.f(3)

NAME

       dpttrs.f -

SYNOPSIS

   Functions/Subroutines
       subroutine dpttrs (N, NRHS, D, E, B, LDB, INFO)
	   DPTTRS

Function/Subroutine Documentation
   subroutine dpttrs (integerN, integerNRHS, double precision, dimension( * )D, double precision, dimension( * )E, double precision, dimension(
       ldb, * )B, integerLDB, integerINFO)
       DPTTRS

       Purpose:

	    DPTTRS solves a tridiagonal system of the form
	       A * X = B
	    using the L*D*L**T 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.

       Parameters:
	   N

		     N is INTEGER
		     The order of the tridiagonal matrix A.  N >= 0.

	   NRHS

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

	   D

		     D is DOUBLE PRECISION array, dimension (N)
		     The n diagonal elements of the diagonal matrix D from the
		     L*D*L**T factorization of A.

	   E

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

	   B

		     B is 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

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

	   INFO

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

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Definition at line 110 of file dpttrs.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.1							  Sun May 26 2013						       dpttrs.f(3)