Объединение множеств

Union

Find set union of two vectors

c = union(A, B) returns the combined values from A and B but with no repetitions. In set theoretic terms, c = A B. Inputs A and B can be numeric or character vectors or cell arrays of strings. The resulting vector is sorted in ascending order.

c = union(A, B, 'rows') when A and B are matrices with the same number of columns returns the combined rows from A and B with no repetitions.

[c, ia, ib] = union(...) also returns index vectors ia and ib such that c = a(ia) b(ib), or for row combinations, c = a(ia,:)? b(ib,:). If a value appears in both a and b, union indexes its occurrence in b. If a value appears more than once in b or in a (but not in b), union indexes the last occurrence of the value.

a = [-1 0 2 4 6]; b = [-1 0 1 3];

[c, ia, ib] = union(a, b);

c =

-1 0 1 2 3 4 6

ia =

3 4 5

ib =

1 2 3 4

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