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MathGroup Archive 2004

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Re: changing replacement rule arrow ( ->) to equal sign(==)...

  • To: mathgroup at smc.vnet.net
  • Subject: [mg45918] Re: changing replacement rule arrow ( ->) to equal sign(==)...
  • From: Harold.Noffke at wpafb.af.mil (Harold Noffke)
  • Date: Thu, 29 Jan 2004 05:36:38 -0500 (EST)
  • References: <bv83l0$idm$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Kim:

You should recognize that ReplaceAll (/.) will work with the names of
Mathematica functions (in your case, Rule (->) and Equal (==) ), but
doesn't seem to work with their multi-character alias strings, even
when these are enclosed in quotes ("->" and "==").

Perhaps someone can tell us why quoted symbol strings won't work when
substituted for their associated function names.

Using your posted equations, we have ...

Mathematica 5.0 for Microsoft Windows
Copyright 1988-2003 Wolfram Research, Inc.
 -- Terminal graphics initialized --

In[1]:= {G[0] -> 4*(5 - 2*Sqrt[6]), tfC[0] -> 2*(5 - 2*Sqrt[6]), C[0]
	-> 3 - Sqrt[6], tf[0] -> 3 - Sqrt[6]} /. Rule -> Equal

Out[1]= {G[0] == 4 (5 - 2 Sqrt[6]), tfC[0] == 2 (5 - 2 Sqrt[6]), C[0]
	== 3 - Sqrt[6], tf[0] == 3 - Sqrt[6]}

In[2]:= {G[0] -> 4*(5 - 2*Sqrt[6]), tfC[0] -> 2*(5 - 2*Sqrt[6]), C[0]
	-> 3 - Sqrt[6], tf[0] -> 3 - Sqrt[6]} /. "->" -> "=="

Out[2]= {G[0] -> 4 (5 - 2 Sqrt[6]), tfC[0] -> 2 (5 - 2 Sqrt[6]), C[0]
	-> 3 - Sqrt[6], tf[0] -> 3 - Sqrt[6]}
	
Regards,
Harold


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