intersect:取交集 unique：取各自独立的部分 union：取并集 setxor：在并集中去除交集 ismember issorted setdiff setxor union unique

Matlab中集合的交运算函数intersect

intersect Set intersection of two vectors

Syntax

c = intersect(A,B) c = intersect(A,B,‘rows’) [c,ia,ib] = intersect(…)

Description

c = intersect(A,B) returns the values common to both A and B. The resulting vector is sorted in ascending order. In set theoretic terms, this is A B. A and B can be cell arrays of strings.

c = intersect(A,B,‘rows’) when A and B are matrices with the same number of columns returns the rows common to both A and B.

[c,ia,ib] = intersect(a,b) also returns column index vectors ia and ib such that c = a(ia) and c = b(ib) (or c = a(ia,:) and c = b(ib,:)).