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MathGroup Archive 2004

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Re: partition of 2D arrray

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49174] Re: [mg49137] partition of 2D arrray
  • From: "camartin at snet.net" <camartin at snet.net>
  • Date: Tue, 6 Jul 2004 03:33:44 -0400 (EDT)
  • References: <200407050854.EAA14710@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Kumar,

Using the DataManipulation package is the easiest way to do this.

In[19]:=
FF={{1,2,3,4},{5,6,7,8},{9,10,11,12},{13,14,15,16}}

Out[19]=
{{1,2,3,4},{5,6,7,8},{9,10,11,12},{13,14,15,16}}

In[20]:=
FF//MatrixForm

In[26]:=
Needs["Statistics`DataManipulation`"]

In[27]:=
xx=ColumnTake[FF,2]

Out[27]=
{{1,2},{5,6},{9,10},{13,14}}

You can also use the Transpose command then select the rows but as the 
package exists you may as well use it. For viewing purposes in 
Mathematica use the //MatrixForm to see that what we did was correct.

Good luck.

Cliff

Ravinder Kumar B. wrote:

>Dear Friends,
>I have a list of 2D data of the following form:
>{{1,2,3,4},{5,6,7,8},{9,10,11,12},{13,14,15,16}};
>In MatrixForm it is 4x4 matrix.
>How do I extract the fisrt two column of the data from the above matrix.
>i.e.,
>{{1,2},{5,6},{9,10},{13,14}}
>
>
>  
>


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