RemoveAdjacentDuplicates
Removes adjacent duplicates from a container.
Syntax
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RemoveAdjacentDuplicates(L)-
Lis a linear container
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RemoveAdjacentDuplicates(L, ε)-
Lis a linear container -
εis a non-negative number
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Description
If L is a list or some other linear container, then RemoveAdjacentDuplicates(L) returns L with all adjacent duplicates removed; each run of identical values is replaced by a single entry of this value.
RemoveAdjacentDuplicates(L, ε) has the same behaviour, except that floating-point comparisons are made with epsilon ε.
Examples
v ≔ ❨2, 1, 1, 2, 1, 3, 4, 1, 1, 2, 3, 4, 5, 1, 5, 1, 2, 3, 4, 1❩;
RemoveAdjacentDuplicates(v)
(2, 1, 2, 1, 3, 4, 1, 2, 3, 4, 5, 1, 5, 1, 2, 3, 4, 1)
RemoveAdjacentDuplicates(v, 1.5)
(2, 4, 1, 3, 5, 1, 5, 1, 3, 1)