DSTERF man page on Scientific

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DSTERF(1)		 LAPACK routine (version 3.2)		     DSTERF(1)

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

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

	   INTEGER	  INFO, N

	   DOUBLE	  PRECISION D( * ), E( * )

PURPOSE
       DSTERF 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) 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.

 LAPACK routine (version 3.2)	 November 2008			     DSTERF(1)
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