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Difference between revisions of "Extracting a Sublist"

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m (It's the lists itselves that are indexed by 1, not the "list functions".)
(Correct the description of sublist/3)
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== Problem ==
 
== Problem ==
Given a list, extract a segment specified by a start and an end index (inclusive).  
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Given a list, extract a segment specified by a start index and an optional length.  
  
 
== Solution ==
 
== Solution ==
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 and ending point in the list.  
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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.
  
 
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Revision as of 23:47, 11 September 2007

Problem

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

Solution

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].
[1,2,3,4,5,6,7,8,9,10]
2> lists:sublist(L,5).
[1,2,3,4,5]

% Take 5 elements from a list, starting from the third position.
3> lists:sublist(L,3,5).
[3,4,5,6,7]

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