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MathGroup Archive 2007

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Marking pivot elements in a matrix?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg74930] Marking pivot elements in a matrix?
  • From: jackgold at umich.edu
  • Date: Wed, 11 Apr 2007 02:04:22 -0400 (EDT)

Hi folks,

I am writing notes for a class in which matrix manipulations
is a necessary and frequent task. At present, when I wish to pick an 
entry of the matrix as a "pivot" I simply write "pivot
on {2, 3}". It would be nice to enclose the {2, 3} entry in a square or 
circle to indicate it is the pivot entry. I am unable to do this. In 
this same vein, I often have need to put a single vertical (horizontal) 
line through the matrix.
Mathematica provides the means for putting vertical (horizontal)
lines in a matrix but it allows only the option of putting lines at 
every column (row). I want to be more selective, say one line
just before the last column. (This is the standard way of indicating
that the last column is an augmentation to the original coefficient
matrix).

Is there any reasonably simple way to do this?


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