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MathGroup Archive 2002

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Re: Re: Replacement question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg35186] Re: [mg35184] Re: [mg35114] Replacement question
  • From: Omega Consulting <omega_consulting at yahoo.com>
  • Date: Sat, 29 Jun 2002 01:37:42 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

At 01:32 AM 6/28/2002, Andrzej Kozlowski wrote:
>I am not sure it is right to say the Omega Consulting method is superior
>for all such situations, because the two methods are not equivalent and
>in certain instances will give different answers.  Holding everything
>unevaluated till the end is not always the best choice.

I also would not claim it is superior in all situations. But I would claim 
that it is a nice way to replace part of an unevaluated input, which is 
what was originally asked for.

>Here is a very
>quickly produced and rather artificial example but I am sure one can
>find more natural ones:
>
>(example omitted)

Such is life in the world of unevaluated expressions. When the evaluation 
takes place is critical to the result you get. There are hundreds of 
different variations and tricks to controlling when evaluation takes place. 
You have to be very careful that what you do is what you want. For those 
who haven't taken a look at it before, I would highly recommend

http://library.wolfram.com/conferences/devconf99/villegas/UnevaluatedExpressions.nb

It does a good job of laying out what unevaluated expressions are about and 
what you can do with them.

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