SRC/dsterf.f(3)            Library Functions Manual            SRC/dsterf.f(3)

NAME
       SRC/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.

       Definition at line 85 of file dsterf.f.

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

LAPACK                          Version 3.12.0                 SRC/dsterf.f(3)