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Re: How to construct symmetric matrix from just a one

  • To: mathgroup at smc.vnet.net
  • Subject: [mg110384] Re: How to construct symmetric matrix from just a one
  • From: Patrick Scheibe <pscheibe at trm.uni-leipzig.de>
  • Date: Wed, 16 Jun 2010 05:38:02 -0400 (EDT)

Hi,

what about

m = {{1, 0, 0, 0}, {2, 3, 0, 0}, {4, 9, 5, 0}, {2, 2, 3, 4}};
m + Transpose[LowerTriangularize[m, -1]] // MatrixForm

?

Cheers
Patrick

On Tue, 2010-06-15 at 02:29 -0400, dragec wrote:
> please help me with simple to apply function that will construct
> symmetric matrix from given just a half matrix with diagonal.
> Eg:
> 
> From:
> 1  0  0  0
> 2  3  0  0
> 4  9  5  0
> 2  2  3  4
> 
> To give:
> 
> 1  2  4  2
> 2  3  9  2
> 4  9  5  3
> 2  2  3  4
> 



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