MathGroup Archive 2002

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MatrixForm Oddity

  • To: mathgroup at
  • Subject: [mg35654] MatrixForm Oddity
  • From: AES <siegman at>
  • Date: Wed, 24 Jul 2002 02:06:32 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

Construct a matrix which has symbol  a  in the upper left (1,1) element 
and symbols  I c  in the rest of the top row and the left-most column, 
dot it into itself three times, and display the result using MatrixForm.

The top row in the display now has  I c (a^2 - 4c^2) ; the left-most 
column now has  I a^2 c - 4 I c^3 .  Not exactly a serious problem, but 
not exactly clean either.  Makes it harder to see at a glance whether a 
given matrix is symmetric above the diagonal (could be a problem in a 
more complicated situation).  Could possibly mess up the behavior of 
pattern matching rules?


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