Re: Matrix rows

*To*: mathgroup at smc.vnet.net*Subject*: [mg65785] Re: [mg65757] Matrix rows*From*: Bob Hanlon <hanlonr at cox.net>*Date*: Mon, 17 Apr 2006 02:28:43 -0400 (EDT)*Reply-to*: hanlonr at cox.net*Sender*: owner-wri-mathgroup at wolfram.com

m = {{1, 2, 3}, {4, 5, 6}, {1, 2, 3}}; If[Length[Union[m]] < Length[m], "duplicate row"] duplicate row Bob Hanlon > > From: "King, Peter R" <peter.king at imperial.ac.uk> To: mathgroup at smc.vnet.net > Subject: [mg65785] [mg65757] Matrix rows > > > [This post has been delayed due to email problems - moderator] > > Another question for which I am sure there is a trivial solution. > > > If I have a matrix (not square - nearly always has more rows than > columns). Is there a simple way to check if two (or more) rows are the > same. I don't need to know how many rows are the same just if any are > the same. Clearly I could loop through the matrix but this must be of > order n^2 for an n row matrix. > > Any suggestions? > >