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MathGroup Archive 2006

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schur decomposition and mathematica

  • To: mathgroup at smc.vnet.net
  • Subject: [mg66937] schur decomposition and mathematica
  • From: "Jeremy Watts" <jwatts1970 at hotmail.com>
  • Date: Sun, 4 Jun 2006 01:11:01 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

why upon entering :-

SchurDecomposition[{{-5.0, 7.0, 6.0, -3.0}, {2.0, -8.0, 3.0, 9.0}, {7.0,
1.0, 2.0, -7.0}, {3.0, 4.0, 4.0, 4.0}}]
does mathematica return a 'T matrix' that is not upper triangular?

some the eigenvalues are complex, so is it because these eigenvalues reside
along the diagonal of 'T' in 2x2 blocks?



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