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how to 'edit' MatrixForm output to create a new matrix?

• To: mathgroup at smc.vnet.net
• Subject: [mg45239] how to 'edit' MatrixForm output to create a new matrix?
• From: nma124 at hotmail.com (steve_H)
• Date: Tue, 23 Dec 2003 05:13:32 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

Hi;

For an example, say I create a 2x3 matrix:

m= { {1, 2, 3}, {4, 5, 6} } // MatrixForm

Now I want to make it say a 3x3 matrix, so I copy the output 
from the above command (by selecting it with the mouse and then 
copy and paste to a new cell)

Now I need to edit the matrix to say add another row or another 
column. But can not figure how to do it.

Need to find out how to insert the mouse inside the matrix and 
tell Mathematica to add a row or a column at that location.

Offcourse I can just use the list formulation and type in the 
new matrix, but I prefer to use the MatrixForm to edit the 
matrix since I can see visually the matrix that way.

So, Is there some sort of visual Matrix editor for Mathematica? or 
a way to do the above?

• Follow-Ups:
  • Re: how to 'edit' MatrixForm output to create a new matrix?
    • From: Yasvir Tesiram <tesiramy@omrf.ouhsc.edu>