Re: Mathematica question

• To: mathgroup at smc.vnet.net
• Subject: [mg124847] Re: Mathematica question
• From: DrMajorBob <btreat1 at austin.rr.com>
• Date: Thu, 9 Feb 2012 05:39:24 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• References: <201202060739.CAA10233@smc.vnet.net>
• Reply-to: drmajorbob at yahoo.com

```He won't miss it, I think.

Bobby

On Wed, 08 Feb 2012 16:37:51 -0600, Barrie Stokes
<Barrie.Stokes at newcastle.edu.au> wrote:

> Bobby
>
> You should give Churchill the credit for this comeback.  ;-)
>
> Barrie
>
>>>> On 08/02/2012 at 9:28 pm, in message
>>>> <201202081028.FAA06426 at smc.vnet.net>,
> DrMajorBob <btreat1 at austin.rr.com> wrote:
>> It's the sort of grammar up with which we should not put!
>>
>> Bobby
>>
>> On Tue, 07 Feb 2012 03:06:37 -0600, Murray Eisenberg
>> <murray at math.umass.edu> wrote:
>>
>>> Yikes: it seems to me that's exactly the sort of expression combining
>>> Postfix with the /@ special input form and pure functions that one
>>> should _not_ write!
>>>
>>> The principal purpose of such special input forms should be to make
>>> expressions easier to read (and write), not more.
>>>
>>> On 2/6/12 2:39 AM, Howie wrote:
>>>> Let's say you've got an expression
>>>>
>>>> expr = {Sin[x] + x^2 - x^2*Cos[x], x^3 (1 + x^2) - x^3, x^4 - x^3}
>>>>
>>>> What does this mean?
>>>>
>>>> Table[expr[[j]] // FullSimplify[#, \$assumptions]&  /@ #&  // Expand //
>>>> @ #&, {j, 3}]
>>>>
>>>> I am new to Mathematica as far as these more complicated expressions
>>>> are concerned.
>>>>
>>>> Can you explain symbol by symbol?
>>>>
>>>> I realize that the [[j]] is Part and that FullSimplify is applied //
>>>> Postfix to expr, but I don't understand what \$assumptions means (I'm
>>>> assuming that these are some assumptions added to FullSimplify) but I
>>>> do not know where these assumptions come from.  Are these assumptions
>>>> the rest of the stuff on the right-hand side?
>>>>
>>>> In reality I have a potentially much more complicated form of the
>>>> expr.
>>>>
>>>> Thanks!
>>>>
>>>>
>>>
>>
>

--
DrMajorBob at yahoo.com

```

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