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Predicate msort/2

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Documentation
- Reference manual
  - Built-in Predicates
    - Built-in list operations
      - is_list/1
      - memberchk/2
      - length/2
      - sort/2
      - sort/4
      - msort/2
      - keysort/2
      - predsort/3
- Packages

Availability:built-in

msort(+List, -Sorted)

Equivalent to sort/2, but does not remove duplicates. Raises a type_error if List is a cyclic list or not a list.

Examples

Counting word frequency

Counting word frequency

word_frequency_count(Words, Counts) :-
    maplist(downcase_atom, Words, LwrWords),
    msort(LwrWords, Sorted),
    clumped(Sorted, Counts).

?- word_frequency_count([a,b,'A',c,d,'B',b,e], Counts).
Counts = [a-2, b-3, c-1, d-1, e-1].

See also: - tokenize_atom/2 or split_string/4 may be used to split a text into tokens