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RedHat 9 (Linux i386) - man page for ssterf (redhat section l)

SSTERF(l)					)					SSTERF(l)

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

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

	   INTEGER	  INFO, N

	   REAL 	  D( * ), E( * )

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

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

       D       (input/output) REAL 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) REAL 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 iter-
	       ations; if INFO = i, then i elements of E have not converged to zero.

LAPACK version 3.0			   15 June 2000 				SSTERF(l)


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