MATLAB Function Reference |
Syntax
Description
c = union(A, B)
returns the combined values from A
and B but with no repetitions. The resulting vector is sorted in ascending order. In set theoretic terms, c = A
B. A and B can be cell arrays of strings.
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.
Examples
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
See Also
intersect
, setdiff
, setxor
, unique
, ismember
, issorted
unicode2native | unique |
© 1994-2005 The MathWorks, Inc.