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MathGroup Archive 2000

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Re: Newbie question: pairswise function application

  • To: mathgroup at smc.vnet.net
  • Subject: [mg23883] Re: Newbie question: pairswise function application
  • From: Avi Mintz <mintza1 at macs.biu.ac.il>
  • Date: Thu, 15 Jun 2000 00:51:20 -0400 (EDT)
  • Organization: Bar-Ilan University, Ramat-Gan, Israel
  • References: <8i1t6n$jn9@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

sort the list.

Avi


On 12 Jun 2000, Sidney Cadot wrote:

> Hi,
> 
> Wandering through the 1500-odd pages of the Mathematica book, I can't
> find the solution to the following rather silly problem:
> 
> I have a list L consisting of (a lot of) integers, and I want to apply a
> function f to all pairs of numbers; furthermore, I don't want to
> calculate both f[a,b] and f[b,a]:
> 
> L = {1,5,19,100};
> 
> ... and I want:
> 
> { f[1,5], f[1,19], f[1,100], f[5,19], f[5,100], f[19,100] }
> 
> Can anyone please tell me how to do this? I'd prefer a smart solution
> (i.e., not just generating all pairs, then throwing away a lot of them)
> since my lists tend to get rather large.
> 
> Thanks in advance,
> 
> Sidney Cadot
> sidney at janis.pds.twi.tudelft.nl
> 
> 
> 



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