MathGroup Archive 2004

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Creating a symmetric matrix

  • To: mathgroup at
  • Subject: [mg46853] Creating a symmetric matrix
  • From: Mark Coleman <mark at>
  • Date: Thu, 11 Mar 2004 03:50:43 -0500 (EST)
  • Sender: owner-wri-mathgroup at


How can I efficiently build a symmetric matrix from an upper triangular 
one, i.e., extract the upper triangular elements and insert them into 
the lower triangle in such a way as to make the resulting square matrix 



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