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MathGroup Archive 2006

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Re: creating a symbolic square symmetric matrix

  • To: mathgroup at smc.vnet.net
  • Subject: [mg66327] Re: creating a symbolic square symmetric matrix
  • From: dh <dh at metrohm.ch>
  • Date: Wed, 10 May 2006 06:33:06 -0400 (EDT)
  • References: <e3pege$ifq$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com


Hi,

simply create the matrix the way you want it:

n = 4;

mat = Table[If[i > j, Subscript[a, j, i], Subscript[a, i, j]], {i, n}, 

{j, n}]



Daniel



ravi wrote:

> Hi,

> First, I created a square matrix with the following command :

> n=4;

> mat=Table[Subscript[a,i, j],{i,n},{j,n}]

> In the same style, I would like to create a symmetric matric where all

> a[i, j] is replaced by a[j,i] for i>j. For i<=j, the coefficients

> remain in place.

> I tried to use the replace command :

> Replace[mat,Subscript[a,i,j]->Subscript[a,j,i]]

> This just interchanged the elements. I want this replacement only for

> the lower or upper triangular matrix elements.

> Would appreciate tips of doing a conditional substitution.

> /ravi

> 



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