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MathGroup Archive 2005

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Re: Re: Re: Bug Report - Two numerical values for a same variable

  • To: mathgroup at smc.vnet.net
  • Subject: [mg54324] Re: [mg54300] Re: [mg54271] Re: Bug Report - Two numerical values for a same variable
  • From: Sseziwa Mukasa <mukasa at jeol.com>
  • Date: Thu, 17 Feb 2005 10:30:43 -0500 (EST)
  • References: <00ed01c512b0$2f242850$6400a8c0@Main> <curpbn$r28$1@smc.vnet.net> <200502150438.XAA29728@smc.vnet.net> <200502161936.OAA19223@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

On Feb 16, 2005, at 2:36 PM, Murray Eisenberg wrote:

> The manipulations below are precisely what's so confusing about 
> Rational
> objects (and Complex objects) being atoms.  If
>
>    1/2 /. Rational[x_, 2] -> Rational[x, 7]
>
> works, then why not the following?
>
>    Part[Rational[1, 2], 2]

Because by definition you cannot use Part on an atom, actually the Help 
Browser says you specifically can't use Map, but I assume Part is 
treated like Map with respect to Atoms.  On the other hand /. 
apparently doesn't have the same restriction.  I know it sounds pat, I 
don't have a good reason for asserting Replace works differently from 
Part with respect to atoms except for the fact that it does.

Regards,

Ssezi


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