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EIGENB.SIF
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***************************
* SET UP THE INITIAL DATA *
***************************
NAME EIGENB
* Problem :
* --------
* Solving symmetric eigenvalue problems as systems of
* nonlinear equations.
* The problem is, given a symmetric matrix A, to find an orthogonal
* matrix Q and diagonal matrix D such that A = Q(T) D Q.
* Example B: a tridiagonal matrix with diagonals 2 and off diagonals -1
* Source: An idea by Nick Gould
* SIF input: Nick Gould, Nov 1992.
* Nonlinear equations version.
* classification NOR2-AN-V-V
* The dimension of the matrix.
*IE N 2 $-PARAMETER
*IE N 10 $-PARAMETER original value
IE N 50 $-PARAMETER
* other parameter definitions
IE 1 1
IE 2 2
IA N-1 N -1
* Define the upper triangular part of the matrix.
AE A(1,1) 2.0
DO J 2 N
IA J-1 J -1
IA J-2 J -2
DO I 1 J-2
AE A(I,J) 0.0
OD I
AE A(J-1,J) -1.0
AE A(J,J) 2.0
OD J
VARIABLES
DO J 1 N
* Define the eigenvalues
X D(J)
DO I 1 N
* Define the eigenvectors
X Q(I,J)
ND
GROUPS
DO J 1 N
DO I 1 J
* Introduce the eigen-equations Q(T) D Q - A = 0.
XE E(I,J)
* Introduce the orthogonality-equations Q(T) Q - I = 0.
XE O(I,J)
ND
CONSTANTS
DO J 1 N
X EIGENB O(J,J) 1.0
DO I 1 J
Z EIGENB E(I,J) A(I,J)
ND
BOUNDS
FR EIGENB 'DEFAULT'
START POINT
XV EIGENB 'DEFAULT' 0.0
DO J 1 N
XV EIGENB D(J) 1.0
XV EIGENB Q(J,J) 1.0
ND
ELEMENT TYPE
EV 2PROD Q1 Q2
EV 3PROD Q1 Q2
EV 3PROD D
ELEMENT USES
DO J 1 N
DO I 1 J
DO K 1 N
XT E(I,J,K) 3PROD
ZV E(I,J,K) Q1 Q(K,I)
ZV E(I,J,K) Q2 Q(K,J)
ZV E(I,J,K) D D(K)
XT O(I,J,K) 2PROD
ZV O(I,J,K) Q1 Q(K,I)
ZV O(I,J,K) Q2 Q(K,J)
ND
GROUP USES
DO J 1 N
DO I 1 J
DO K 1 N
XE E(I,J) E(I,J,K)
XE O(I,J) O(I,J,K)
ND
ENDATA
***********************
* SET UP THE FUNCTION *
* AND RANGE ROUTINES *
***********************
ELEMENTS EIGENB
INDIVIDUALS
T 2PROD
F Q1 * Q2
G Q1 Q2
G Q2 Q1
H Q1 Q2 1.0D+0
T 3PROD
F Q1 * Q2 * D
G Q1 Q2 * D
G Q2 Q1 * D
G D Q1 * Q2
H Q1 Q2 D
H Q1 D Q2
H Q2 D Q1
ENDATA