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MathGroup Archive 2002

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RE: RE: Question about Replace

  • To: mathgroup at smc.vnet.net
  • Subject: [mg35713] RE: [mg35696] RE: [mg35670] Question about Replace
  • From: "DrBob" <majort at cox-internet.com>
  • Date: Sat, 27 Jul 2002 06:43:14 -0400 (EDT)
  • Reply-to: <drbob at bigfoot.com>
  • Sender: owner-wri-mathgroup at wolfram.com

Actually, she wants a change of variables: expr/.x->z-y/.z->x.

-----Original Message-----
From: David Park [mailto:djmp at earthlink.net] 
To: mathgroup at smc.vnet.net
Subject: [mg35713] [mg35696] RE: [mg35670] Question about Replace

Heather,

It works.

x + y + z/(x + y) + e^(x + y) + w*x + y /. x + y -> x
e^x + x + w*x + 2*y + z/x

Since you wrote w*x + y and not w*(x+y) Mathematica simplified to obtain
x +
2y so there is no replacement there.

But generally you will have to use ReplaceRepeated (//.).

x + y + z/(x + y) + e^(x + y) + w*(x + y) //. x + y -> x
e^x + x + w*x + z/x

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/



From: Xuguang Zhang [mailto:xzhang2 at is2.dal.ca]
To: mathgroup at smc.vnet.net


Hello All,

I have an expression: x+y+z/(x+y)+e^(x+y)+w*x+y.... I want to replace
any (x+y) term by x no matter how the expression looks like.  I tried
"/."command. However, it does not work properly. Is there any simple way
of doing this? Thanks.

--
Xuguang(Heather) Zhang








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