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-- Status: rewritten July 2018
-- Author: Lily Silverstein
doc///
Key
unique
(unique, List)
(unique, Sequence)
Headline
eliminate duplicates from a list
Usage
unique(L)
Inputs
L:List
or sequence
Outputs
M:List
the elements of {\tt L} without duplicates
Description
Text
The output list maintains the order of elements in {\tt L}.
Example
unique {3,2,1,3,2,4,a,3,2,3,-2,1,2,4}
Text
Another way to list the unique elements of {\tt L} is by creating a
set from {\tt L} and then listing its elements. This may be slightly
faster than {\tt unique}, but forgets the ordering of {\tt L}.
Example
toList set {3,2,1,3,2,4,a,3,2,3,-2,1,2,4}
Text
To count occurrences of each element, use @TO tally@. To create
a sorted list, see @TO sort@. For an overview of lists and sequences,
see @TO"lists and sequences"@.
SeeAlso
same
sort
set
tally
uniform
"lists and sequences"
///
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