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MathGroup Archive 2005

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Re: How to "search" in a matrix?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg60914] Re: How to "search" in a matrix?
  • From: Bill Rowe <readnewsciv at earthlink.net>
  • Date: Mon, 3 Oct 2005 04:06:13 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

On 10/2/05 at 1:54 AM, renan.birck at gmail.com (Renan) wrote:

>I have this matrix:

>matr = {{a, b, 1}, {c, d, 2}, {e, f, 3}}

>I'm trying to do a "search" in a matrix. The "real" matrix will
>contain strings. How to "search" for a given value in a matrix and
>return all lines that have it?

>'Select' seems to handle only lists - and this would require a
>Flatten, probably making my code too complicated and maybe slow
>(the real matrix will contain something like 100 elements - weather
>data).

Try

Select[matr, MemberQ[#, d]&]

or for a matrix of strings

Select[matr, MemberQ[#,"d"]&]
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