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MathGroup Archive 2006

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Re: Matrix rows

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

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>
To: mathgroup at
> 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?

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