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spttrf.f(3)				      LAPACK				      spttrf.f(3)

NAME
       spttrf.f -

SYNOPSIS
   Functions/Subroutines
       subroutine spttrf (N, D, E, INFO)
	   SPTTRF

Function/Subroutine Documentation
   subroutine spttrf (integerN, real, dimension( * )D, real, dimension( * )E, integerINFO)
       SPTTRF

       Purpose:

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

       Parameters:
	   N

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

	   D

		     D is REAL 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**T factorization of A.

	   E

		     E is REAL 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**T factorization of A.
		     E can also be regarded as the superdiagonal of the unit
		     bidiagonal factor U from the U**T*D*U factorization of A.

	   INFO

		     INFO is 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.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Definition at line 92 of file spttrf.f.

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

Version 3.4.2				 Tue Sep 25 2012			      spttrf.f(3)
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