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MathGroup Archive 2004

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Re: how to delete duplicate items in the same list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg45598] Re: how to delete duplicate items in the same list
  • From: drbob at bigfoot.com (Bobby R. Treat)
  • Date: Fri, 16 Jan 2004 06:05:14 -0500 (EST)
  • References: <bto1uf$2ka$1@smc.vnet.net> <bu0cjl$ah9$1@smc.vnet.net> <bu2oot$jhq$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Look up Union in help and you'll see that its main purpose is to form
the set-theoretic union of two lists. The result is a set with no
duplicate elements, so it's a simple way to get the result that was
needed in this case.

Bobby

AES/newspost <siegman at stanford.edu> wrote in message news:<bu2oot$jhq$1 at smc.vnet.net>...
> > > I can't find a way to make sure all items in the same list are unique. Can
> > > anybody help me out? Thanks a lot!
>  
> > Union[a]==a
> 
> 
> Can anyone explain why "Union" means what it does?  -- or at least a 
> mental crutch to help me remember that Union is the command that does 
> this?
> 
> (Doesn't seem an obvious name for the function involved, though I 
> suppose I could try to think "Unique" --->  "Union")


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