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Re: Generalizing Complement to handle multiple occurrences of elements

  • To: mathgroup at smc.vnet.net
  • Subject: [mg112468] Re: Generalizing Complement to handle multiple occurrences of elements
  • From: Ray Koopman <koopman at sfu.ca>
  • Date: Thu, 16 Sep 2010 06:01:33 -0400 (EDT)
  • References: <i6q0ml$l7c$1@smc.vnet.net>

On Sep 15, 1:38 am, Mark Coleman <markspcole... at gmail.com> wrote:
> Greetings,
>
> I'm wondering how one can efficiently generalize the built-in
> Complement function to return multiple occurrences of elements. For
> instance, the current version generates
>
> a={1,2,2,3,4,4,4,4}
> b={3,5,7}
>
> Complement[a,b]={1,2,4}
>
> I'm looking for a way to define
>
> myComplement[a,b]={1,2,2,4,4,4,4}
>
> My current code is very inefficient!
>
> Thanks,
>
> Mark

What do you want  myComplement[{1,2,2,3,4,4,4,4},
                               {1,2,    4,4,   5,7}]
to return: {2,3,4,4} or {3}?


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