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DSTERF(3F)							    DSTERF(3F)


NAME    [Toc]    [Back]

     DSTERF - compute all eigenvalues of a symmetric tridiagonal matrix	using
     the Pal-Walker-Kahan variant of the QL or QR algorithm

SYNOPSIS    [Toc]    [Back]

     SUBROUTINE	DSTERF(	N, D, E, INFO )

	 INTEGER	INFO, N

	 DOUBLE		PRECISION D( * ), E( * )

PURPOSE    [Toc]    [Back]

     DSTERF computes all eigenvalues of	a symmetric tridiagonal	matrix using
     the Pal-Walker-Kahan variant of the QL or QR algorithm.

ARGUMENTS    [Toc]    [Back]

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

     D	     (input/output) DOUBLE PRECISION array, dimension (N)
	     On	entry, the n diagonal elements of the tridiagonal matrix.  On
	     exit, if INFO = 0,	the eigenvalues	in ascending order.

     E	     (input/output) DOUBLE PRECISION array, dimension (N-1)
	     On	entry, the (n-1) subdiagonal elements of the tridiagonal
	     matrix.  On exit, E has been destroyed.

     INFO    (output) INTEGER
	     = 0:  successful exit
	     < 0:  if INFO = -i, the i-th argument had an illegal value
	     > 0:  the algorithm failed	to find	all of the eigenvalues in a
	     total of 30*N iterations; if INFO = i, then i elements of E have
	     not converged to zero.
DSTERF(3F)							    DSTERF(3F)


NAME    [Toc]    [Back]

     DSTERF - compute all eigenvalues of a symmetric tridiagonal matrix	using
     the Pal-Walker-Kahan variant of the QL or QR algorithm

SYNOPSIS    [Toc]    [Back]

     SUBROUTINE	DSTERF(	N, D, E, INFO )

	 INTEGER	INFO, N

	 DOUBLE		PRECISION D( * ), E( * )

PURPOSE    [Toc]    [Back]

     DSTERF computes all eigenvalues of	a symmetric tridiagonal	matrix using
     the Pal-Walker-Kahan variant of the QL or QR algorithm.

ARGUMENTS    [Toc]    [Back]

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

     D	     (input/output) DOUBLE PRECISION array, dimension (N)
	     On	entry, the n diagonal elements of the tridiagonal matrix.  On
	     exit, if INFO = 0,	the eigenvalues	in ascending order.

     E	     (input/output) DOUBLE PRECISION array, dimension (N-1)
	     On	entry, the (n-1) subdiagonal elements of the tridiagonal
	     matrix.  On exit, E has been destroyed.

     INFO    (output) INTEGER
	     = 0:  successful exit
	     < 0:  if INFO = -i, the i-th argument had an illegal value
	     > 0:  the algorithm failed	to find	all of the eigenvalues in a
	     total of 30*N iterations; if INFO = i, then i elements of E have
	     not converged to zero.


									PPPPaaaaggggeeee 1111
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