Re: Removing list elements in x by list y

*To*: mathgroup at smc.vnet.net*Subject*: [mg131145] Re: Removing list elements in x by list y*From*: Daniel <dosadchy at its.jnj.com>*Date*: Fri, 14 Jun 2013 05:00:55 -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

This will do: Select[x, FreeQ[y, #] &] or Cases[x, v_ /; FreeQ[y, v]] > 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 >