Consider this matrix:
> sg
X1 X2 X3 X4 X5
1 3.240 2.592 2.592 2.592 2.592
2 2.592 3.240 2.592 2.592 2.592
3 2.592 2.592 3.240 2.592 2.592
4 2.592 2.592 2.592 3.240 2.592
5 2.592 2.592 2.592 2.592 3.240
If I compute the eigenvalues of the 'sg' matrix using R Version 1.5.0
(2002-04-29) under Linux (or using Version 1.4.0 (2001-12-19) under
Solaris), I obtain:
> eigen(sg)
$values
[1] 13.608 0.648 0.648 0.648 0.648
I also obtain the same eigenvalues under R Version 1.5.1 (2002-06-17) under
Mac OS X 10.2.3.
However, if I compute the eigenvalues of the 'sg' matrix using R Version
1.6.1 (2002-11-01) under Mac OS X 10.2.3, I obtain a different answer:
> eigen(sg)
$values
[1] 13.123930 0.648000 0.648000 0.648000 -1.732930
> det(sg)
[1] 2.399354
> det(sg,method="eigenvalues")
[1] -7.312317
Thanks,
-- Dan --
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