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MathGroup Archive 2007

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Re: Slots & Ampersands

  • To: mathgroup at smc.vnet.net
  • Subject: [mg74377] Re: Slots & Ampersands
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Mon, 19 Mar 2007 21:56:58 -0500 (EST)
  • Organization: The Open University, Milton Keynes, UK
  • References: <etlq8s$rab$1@smc.vnet.net>

Mr Ajit Sen wrote:
>   Dear MathGroup,
> 
>  I've always regarded the Slot and Ampersand as being
>  inseparable in Mathematica (the Laurel & Hardy of 
>  Mathematica?), and was surprised to find one of them absent

Only # or ## can be drooped (constant functions that do not depend on 
the values of some parameters).
The symbol & marks the end of the definition of the pure function.

> in
> 
>    Plot[Sin[x], {x, 0, 2Pi}, ColorOutput -> 
>       (RGBColor[1, 0, 0]&)]
> 
>  [Help Browser under ColorOutput::colpc ,Examples]
> 
>   Question 1
> 
>   Where is Laurel gone? Is he inside ColorOutput or
>   RGBColor?

No need: this is a constant function that always returns red.

>   Question 2
> 
>   Are there other similar constructs in Mathematica? [No # ]

Yes.

The thread called "& without #" is worth reading. See
http://forums.wolfram.com/mathgroup/archive/2007/Jan/msg00605.html

Regards,
Jean-Marc


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