Services & Resources / Wolfram Forums
MathGroup Archive
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2000

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

Search the Archive

Re: Sorting with Infinity

  • To: mathgroup at
  • Subject: [mg23523] Re: [mg23513] Sorting with Infinity
  • From: Jack Goldberg <jackgold at>
  • Date: Tue, 16 May 2000 22:29:55 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

Hi all,

I can't believe I missed this.  I even thought of using a Sort function!!!
Thank you all for your forbearance.  


On Tue, 16 May 2000, Jack Goldberg wrote:

> Hi group;
> I construct lists which may look like this
> 	{7,-2,-Infinity,Infinity,1}
> When this list is sorted by using Sort, I get
> 	{-2,1,7,-Infinity,Infinity}
> I would prefer, naturally, 
> 	{-Infinity,-2,1,7,Infinity}
> This is easy to do if one doesn't care about elegance.  Without 
> spelling out the obvious details, here are a few kludges:
> (1) Replace Infinity by 10^15, Sort  then switch back to Infinity.
> (2) Use Append and Prepend after Sort and  deleting infinities.
> (3) RotateRight after Sort and switch signs on infinities
> Anyone got a "cute" solution say by using a sorting function or 
> perhaps some arcane command unknown to mere mortals? 
> Jack

  • Prev by Date: v3.0 print bugs in v4.0?
  • Next by Date: Re: Sorting with Infinity
  • Previous by thread: Re: Sorting with Infinity
  • Next by thread: Re: Sorting with Infinity