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MathGroup Archive 2004

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RE: partition of 2D arrray

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49173] RE: [mg49137] partition of 2D arrray
  • From: "David Park" <djmp at earthlink.net>
  • Date: Tue, 6 Jul 2004 03:33:42 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Ravi,

Use All to specify all rows and then list the columns you want.

data = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}, {13, 14, 15, 16}};

Part[data, All, {1, 2}]
{{1, 2}, {5, 6}, {9, 10}, {13, 14}}

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


From: Ravinder Kumar B. [mailto:ravi at crest.ernet.in]
To: mathgroup at smc.vnet.net

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}}


-- 
 Regards,                                   Jul 2
    Ravi



         |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|
         |           Ravinder Kumar Banyal (SRF),                |
         |          Indian Institute of Astrophysics,            |
         |           Koramangala Bangalore - 560 034. INDIA      |
         | email : banyal at iiap.res.in, ravi at crest.ernet.in       |
         | Ph No : 080 25530672 (IIA)       080 7931972 (Hoskote)|
         |                                     7931952           |
          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Philosophers have interpreted the world in various ways, but the point is
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