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 ==== [MESSAGE SEPARATOR] ====