f02abf

f02abf © Numerical Algorithms Group, 2002.

Purpose

F02ABF All eigenvalues and eigenvectors of real symmetric matrix (Black Box)

Synopsis

[r,v,ifail] = f02abf(a<,ifail>)

Description

 
 This routine reduces the real symmetric matrix A to a real 
 symmetric tridiagonal matrix by Householder's method. The 
 eigenvalues and eigenvectors are calculated using the QL 
 algorithm.

Parameters

f02abf

Required Input Arguments:

a (:,:)                               real

Optional Input Arguments:                       <Default>

ifail                                 integer  -1

Output Arguments:

r (:)                                 real
v (:,:)                               real
ifail                                 integer