How to extract data from a list?

Question

I have a long list of coordinates defined in some 8D space. I need to extract the first three coordinates only. How ?

For example :

coords = {{0.1, 0.4, -0.2, 1.2, 3.2, 0.5, 0.8, 2.2}, ...};

I need to define the list of all first three components :

reducedCoords := {{0.1, 0.4, -0.2}, ...}

Please, notice that I'm working with Mathematica 7.

Take[#, 3] & /@ coords takes first three elements from each sublist. — BoLe, Mar 29 '13 at 15:37

score 5 · Accepted Answer · answered Mar 29 '13 at 15:35

5

This is core functionality:

coords = Table[Range[5], {3}]

{{1, 2, 3, 4, 5}, {1, 2, 3, 4, 5}, {1, 2, 3, 4, 5}}

coords[[All, 1 ;; 3]]

{{1, 2, 3}, {1, 2, 3}, {1, 2, 3}}

answered Mar 29 '13 at 15:35

Vitaliy Kaurov

1 Answers1