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MathGroup Archive 2001

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Re: Meaning of @ ... not @@

  • To: mathgroup at smc.vnet.net
  • Subject: [mg32161] Re: [mg32152] Meaning of @ ... not @@
  • From: BobHanlon at aol.com
  • Date: Sun, 30 Dec 2001 02:54:26 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

In a message dated 12/29/01 6:59:12 PM, dot at dot.dot writes:

>I'm sure I've seen this before, but cannot find the answer on the archive
>because I can't think of a sensible way of limiting the search!
>
>What, please, is the meaning of @ as in
>Conjugate @ Reverse @ Drop[list, -1]
>
>I seem to remember reading that this was "undocumented", and I cannot find
>it in the help. The above line appears in mg1432 in the archive.

This notation is included in section A.2.7; however, the easiest approach is 
just to use it and see what it does.

f @ x

f[x]

Consequently,

Conjugate@Reverse@Drop[lst,-1] == 
  Conjugate[Reverse[Drop[lst,-1]]] == 
  (Drop[lst,-1] // Reverse // Conjugate)

True


Bob Hanlon
Chantilly, VA  USA


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