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Re: Removing list elements in x by list y

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  • Subject: [mg131159] Re: Removing list elements in x by list y
  • From: Tomas Garza <tgarza10 at msn.com>
  • Date: Fri, 14 Jun 2013 05:05:36 -0400 (EDT)
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In[1]:=Select[x, !MemberQ[y, #]&]
Out[1]= {v,w,w}

-Tomas

> From: weh at snafu.de
> Subject: Removing list elements in x by list y
> To: mathgroup at smc.vnet.net
> Date: Thu, 13 Jun 2013 02:36:35 -0400
>
> I have simple question.
>
> Given two lists
>
> x = {u, v, w, w, d};
> y = {u, d};
>
> I wish to "subtract" y from x, i.e. remove exactly the elements in x
> which belong to y giving
>
> x "-" y = {v,w,w}
>
> Complement[] gives instead {v,w}.
> Note that we are talking about lists rather than sets.
>
> I'm sure there is a simple standard command, but I can't find it.
> Can you?
>
> Regards,
> Wolfgang
>


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