dpttrf man page on YellowDog

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DPTTRF(l)			       )			     DPTTRF(l)

NAME
       DPTTRF  - compute the L*D*L' factorization of a real symmetric positive
       definite tridiagonal matrix A

SYNOPSIS
       SUBROUTINE DPTTRF( N, D, E, INFO )

	   INTEGER	  INFO, N

	   DOUBLE	  PRECISION D( * ), E( * )

PURPOSE
       DPTTRF computes the L*D*L' factorization of a real  symmetric  positive
       definite	 tridiagonal  matrix A. The factorization may also be regarded
       as having the form A = U'*D*U.

ARGUMENTS
       N       (input) INTEGER
	       The order of the matrix A.  N >= 0.

       D       (input/output) DOUBLE PRECISION array, dimension (N)
	       On entry, the n diagonal elements of the tridiagonal matrix  A.
	       On  exit, the n diagonal elements of the diagonal matrix D from
	       the L*D*L' factorization of A.

       E       (input/output) DOUBLE PRECISION array, dimension (N-1)
	       On entry, the (n-1) subdiagonal	elements  of  the  tridiagonal
	       matrix  A.  On exit, 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 U'*D*U factorization of A.

       INFO    (output) INTEGER
	       = 0: successful exit
	       < 0: if INFO = -k, the k-th argument had an illegal value
	       > 0: if INFO = k, the leading minor of order k is not  positive
	       definite;  if  k < N, the factorization could not be completed,
	       while if k = N, the factorization was completed, but D(N) = 0.

LAPACK version 3.0		 15 June 2000			     DPTTRF(l)
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