Re: Joining 2D arrays

*To*: mathgroup at smc.vnet.net*Subject*: [mg49160] Re: [mg49131] Joining 2D arrays*From*: Ken Levasseur <klevasseur at mac.com>*Date*: Mon, 5 Jul 2004 04:55:00 -0400 (EDT)*References*: <200407020601.CAA05445@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Jonathan: Union will do it for the example you give. In[5]:= Union[A, B] Out[5]= {{1, 2}, {3, 4}, {5, 6}, {6, 7}, {8, 9}, {10, 11}, {12, 13}} For tables of the size you describe, you might need to do something else. Ken Levasseur On Jul 2, 2004, at 2:01 AM, Jonathan Greenberg wrote: > 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 >

**References**:**Joining 2D arrays***From:*Jonathan Greenberg <greenberg@ucdavis.edu>