Re: Removing list elements in x by list y
- To: mathgroup at smc.vnet.net
- Subject: [mg131154] Re: Removing list elements in x by list y
- From: Ray Koopman <koopman at sfu.ca>
- Date: Fri, 14 Jun 2013 05:03:56 -0400 (EDT)
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DeleteCases[x,Alternatives@@y] ----- Dr. Wolfgang Hintze <weh at snafu.de> wrote: > 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