Re: Re: Testing Mathematica Expressions?

• To: mathgroup at smc.vnet.net
• Subject: [mg106645] Re: [mg106622] Re: Testing Mathematica Expressions?
• From: Andrzej Kozlowski <akozlowski at gmail.com>
• Date: Wed, 20 Jan 2010 06:46:56 -0500 (EST)
• References: <hiuusd\$92o\$1@smc.vnet.net> <hj131r\$be8\$1@smc.vnet.net> <201001191012.FAA28974@smc.vnet.net>

```On 19 Jan 2010, at 11:12, AES wrote:

> In article <hj131r\$be8\$1 at smc.vnet.net>, Noqsi <jpd at noqsi.com> wrote:
>
>> On Jan 17, 5:13 am, AES <sieg... at stanford.edu> wrote:
>>
>>> 5)  Is  ToExpression["exprx"] /. ruleOne  really exactly the same thing
>>> (or, will it produce exactly the same results) as    exprx /. ruleOne?
>>
>> That you even ask this question shows that you simply haven't done
>
> "An example is worth a thousand words."
>
> I'd be glad to spend some time perusing and attempting to understand an
> example (the simple the better, of course) for which
>
>     ToExpression["soks"] /. ruleOne
>
> and
>
>     soks /. ruleOne
>
> typed into separate Input cells under identical starting conditions,
> where 'soks' is a sequence of key strokes, yield differing results when
> evaluated.
>
Unevaluated[x] /. x -> 3

3

while

ToExpression["Unevaluated[x]"] /. x -> 3

Unevaluated[3]

Andrzej Kozlowski

```

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