Creating a symmetric matrix

*To*: mathgroup at smc.vnet.net*Subject*: [mg46853] Creating a symmetric matrix*From*: Mark Coleman <mark at markscoleman.com>*Date*: Thu, 11 Mar 2004 03:50:43 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

Greetings, 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 symmetric? Thanks, Mark

**Follow-Ups**:**Re: Creating a symmetric matrix***From:*"Sseziwa Mukasa,,(978) 536-2359" <mukasa@jeol.com>

**Re: Creating a symmetric matrix***From:*Oleksandr Pavlyk <pavlyk@phys.psu.edu>

**Re: Creating a symmetric matrix***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>