NAME

       dsterf.f -

SYNOPSIS

   Functions/Subroutines
       subroutine dsterf (N, D, E, INFO)
           DSTERF

Function/Subroutine Documentation

   subroutine dsterf (integer N, double precision, dimension( * ) D, double precision, dimension(
       * ) E, integer INFO)
       DSTERF

       Purpose:

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

       Parameters:
           N

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

           D

                     D is 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

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

           INFO

                     INFO is 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.

       Author:
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Date:
           November 2011

Author

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