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Re: Sequential evaluation of lists

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

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.

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?

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