RE : partition of 2D arrray
- To: mathgroup at smc.vnet.net
- Subject: [mg49162] RE : [mg49137] partition of 2D arrray
- From: "Florian Jaccard" <florian.jaccard at eiaj.ch>
- Date: Tue, 6 Jul 2004 03:33:20 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Lot of possibilities !
For example :
mat = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}, {13, 14, 15, 16}};
In[45]:=
mat /. {(a_)?NumericQ, b_, _, _} -> {a, b}
Out[45]=
{{1, 2}, {5, 6}, {9, 10}, {13, 14}}
In[48]:=
(Take[#1, 2] & ) /@ mat
Out[48]=
{{1, 2}, {5, 6}, {9, 10}, {13, 14}}
F.Jaccard
-----Message d'origine-----
De : Ravinder Kumar B. [mailto:ravi at crest.ernet.in]
Envoyé : lundi, 5. juillet 2004 10:54
À : mathgroup at smc.vnet.net
Objet : [mg49137] partition of 2D arrray
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)|
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