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Extracting a Sublist

Revision as of 23:47, 11 September 2007 by Chinnucsk (Talk | contribs)


Given a list, extract a segment specified by a start index and an optional length.


Use the lists module sublist/2 or sublist/3 functions. The sublist/2 function takes the first N elements from a list, while the sublist/3 function takes a starting point in the list and the maximum number of elements to extract.

% Take the first 5 elements of a list
1> L = [1,2,3,4,5,6,7,8,9,10].
2> lists:sublist(L,5).

% Take 5 elements from a list, starting from the third position.
3> lists:sublist(L,3,5).

Please note that all functions assume the position numbering starts at 1.