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MathGroup Archive 1996

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Re: HELP:problems simplifying big matrices

  • To: mathgroup at smc.vnet.net
  • Subject: [mg4740] Re: [mg4720] HELP:problems simplifying big matrices
  • From: Allan Hayes <hay at haystack>
  • Date: Mon, 2 Sep 1996 01:51:29 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

"Stephen O'Sullivan" <so at cp.dias.ie>
[mg4720] HELP:problems simplifying big matrices
writes,
>>>>>>
I wish to simplify large matrices by identifying occurrences of  
specific algebraic expressions and replacing them with a variable  
name. The problem is that unless the expressions to be
replaced occur in precisely the form specified by the given  
transformation rule it doesn't spot them. Any simple solutions?
<<<<<<<<

Stephen,
I wonder if something along the lines of

{1/x +x, (1+x^2)/x}/. r_/;MatchQ[Simplify[r],1/x +x] ->p

	{p, p}

might help (you may need to use something else instead of Simplify).

Allan Hayes
hay at haystack.demon.co.uk

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