f02aff

f02aff © Numerical Algorithms Group, 2002.

Purpose

F02AFF All eigenvalues of real matrix (Black Box)

Synopsis

[rr,ri,intger,ifail] = f02aff(a<,ifail>)

Description

 
 The matrix A is first balanced and then reduced to upper 
 Hessenberg form using stabilised elementary similarity 
 transformations. The eigenvalues are then found using the QR 
 algorithm for real Hessenberg matrices.

Parameters

f02aff

Required Input Arguments:

a (:,:)                               real

Optional Input Arguments:                       <Default>

ifail                                 integer  -1

Output Arguments:

rr (:)                                real
ri (:)                                real
intger (:)                            integer
ifail                                 integer