Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2004
*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 2004

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

Search the Archive

Re: Sequential evaluation of lists

  • To: mathgroup at smc.vnet.net
  • Subject: [mg53088] Re: [mg53076] Sequential evaluation of lists
  • From: János <janos.lobb at yale.edu>
  • Date: Thu, 23 Dec 2004 07:58:22 -0500 (EST)
  • References: <200412220953.EAA04525@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

It would be nice to have all List manipulation functions have an option 
Direction->Left or Direction->Right, just as Limit has +1 or -1. I even 
would like functional programming functions like Map or Apply have this 
option. Any seesaw type operation modeling would greatly benefit from 
it and nature has many.

János
On Dec 22, 2004, at 4:53 AM, Ray Koopman wrote:



> When I first started using Mathematica (v2), one of the features that
> I found rather surprising is its sequential evaluation of lists, as in
>
> In[1]:= x = 0; {x++,x++,x++}
> Out[1]= {0,1,2}
>
> I had expected a warning that such code should be avoided because
> it presumed sequential evaluation, which could not be guaranteed,
> and a recommendation to treat list elements as being evaluated in
> parallel -- if not simultaneously then in no particular order.
> However, so far I have found no exception to sequential evaluation
> and no mention of it in any documentation. Have I missed something?
>


  • Prev by Date: Re: Differentiate of Abs[x] ???
  • Next by Date: Excel Link Problem
  • Previous by thread: Sequential evaluation of lists
  • Next by thread: Re: Re: Sequential evaluation of lists