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Removing list elements in x by list y

  • To: mathgroup at smc.vnet.net
  • Subject: [mg131122] Removing list elements in x by list y
  • From: "Dr. Wolfgang Hintze" <weh at snafu.de>
  • Date: Thu, 13 Jun 2013 02:36:35 -0400 (EDT)
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  • Delivered-to: l-mathgroup@wolfram.com
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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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