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MathGroup Archive 2005

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


The language IS the documentation, as they say.

Bobby

On Thu, 17 Feb 2005 10:30:43 -0500 (EST), Sseziwa Mukasa <mukasa at jeol.com> wrote:

> 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
>
>
>
>



-- 
DrBob at bigfoot.com
www.eclecticdreams.net


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