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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```

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