Re: Removing list elements in x by list y

*To*: mathgroup at smc.vnet.net*Subject*: [mg131144] Re: Removing list elements in x by list y*From*: Ulrich Arndt <ulrich.arndt at data2knowledge.de>*Date*: Fri, 14 Jun 2013 05:00:35 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-outx@smc.vnet.net*Delivered-to*: mathgroup-newsendx@smc.vnet.net*References*: <20130613063635.3F7206A2A@smc.vnet.net>

There will be many other ways to do that but this works for the example Delete[x, Flatten[Position[x, #] & /@ y, 1]] But what would you expect as a result in case of y = {u,w}? Am 13.06.2013 um 08:36 schrieb Dr. Wolfgang Hintze: > 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 >

**References**:**Removing list elements in x by list y***From:*"Dr. Wolfgang Hintze" <weh@snafu.de>