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MathGroup Archive 1996

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Re: Part

  • To: mathgroup at smc.vnet.net
  • Subject: [mg2895] Re: Part
  • From: wagner at bullwinkle.cs.Colorado.EDU (Dave Wagner)
  • Date: Fri, 5 Jan 1996 03:02:36 -0500
  • Organization: University of Colorado, Boulder

In article <4cgrsc$im4 at dragonfly.wri.com>,
Hans Steffani <hans.steffani at e-technik.tu-chemnitz.de> wrote:
>w={{1,2,3},{4,5,6},{7,8,9}}
>npos={2,1}
>
>npos is the position of the element I need.
>
>w[[npos]]
>
>does not work, as it returns the second and the first
>line.

This same question came up a couple of weeks ago.  You want
to use:

	w[[Sequence @@ npos]]

Sequence is an undocumented function that obliterates the head
of whatever it is applied to.  In this case, it obliterates the
List wrapper, leaving a sequence of two integers.


		Dave Wagner
		Principia Consulting
		(303) 786-8371
		dbwagner at princon.com
		http://www.princon.com/princon

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