Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
1998
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 1998

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Q:efficient list operation wanted

  • To: mathgroup at smc.vnet.net
  • Subject: [mg14023] Re: Q:efficient list operation wanted
  • From: mefisher at my-dejanews.com
  • Date: Wed, 16 Sep 1998 14:12:03 -0400
  • Organization: Deja News - The Leader in Internet Discussion
  • References: <6ten6q$3ii@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

In article <6ten6q$3ii at smc.vnet.net>,
  Allan Hayes <hay at haystack.demon.co.uk> wrote:
>
> L1 = {1,2,3,4,5,3,7,2,3,9} ;
> L2 = {a, b, c};
>
> L1[[Flatten[Position[L1,3]]]]= L2;
>
> L1
>
> {1,2,a,4,5,b,7,2,c,9}
>

I like it, but I don't understand the logic of the evaluation of the
lhs. Is this non-standard? Why does the evaluation of the lhs
apparently stop at Part[L1, {3,6,9}]? Did earlier versions of
Mathematica behave this way?

--Mark
mark.fisher at atl.frb.org

-----== Posted via Deja News, The Leader in Internet Discussion ==-----
http://www.dejanews.com/rg_mkgrp.xp   Create Your Own Free Member Forum


  • Prev by Date: Re: list referencing with [[]][[]]
  • Next by Date: Linear Algebra and Matrix Manipulation Archives?
  • Previous by thread: Re: Q:efficient list operation wanted
  • Next by thread: Symbolic Matrix Inversion -- What's the best method for Rank under 100?