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MathGroup Archive 2004

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RE: Joining 2D arrays

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49145] RE: [mg49131] Joining 2D arrays
  • From: "David Park" <djmp at earthlink.net>
  • Date: Mon, 5 Jul 2004 04:54:23 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Jonathan,

A={{1,2},{3,4},{5,6}};
B={{6,7},{8,9},{10,11},{12,13}};

Join[A,B]

Also you may want to check out the standard package
LinearAlgebra`MatrixManipulation` and, if you want to select columns, how to
use the Part command with All.

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/


From: Jonathan Greenberg [mailto:greenberg at ucdavis.edu]
To: mathgroup at smc.vnet.net


This is a total newbie question, but if I have two table of a fixed number
of columns and an arbitrary number of rows, whats the easiest/most efficient
way to join them together (basically, how do I add entries to a "database"
in Mathematica) -- that database will eventually be perhaps > 1,000,000
entries long...

A={{1,2},{3,4},{5,6}}
B={{6,7},{8,9},{10,11},{12,13}}

I want:

{{1,2},{3,4},{5,6},{6,7},{8,9},{10,11},{12,13}}

--j




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