MATLAB Function Reference

ismember

Detect members of a set

Syntax

k = ismember(a,S)
k = ismember(A,S,'rows')

Description

k = ismember(a,S) returns an vector the same length as a containing logical true (1) where the elements of a are in the set S, and logical false (0) elsewhere. In set theoretic terms, k is 1 where a S. a and S can be cell arrays of strings.

k = ismember(A,S,'rows') when A and S are matrices with the same number of columns returns a vector containing 1 where the rows of A are also rows of S and 0 otherwise.

Examples

set = [0 2 4 6 8 10 12 14 16 18 20];
a = reshape(1:5,[5 1])

a =

     1
     2
     3
     4
     5

ismember(a,set)

ans =
      0
      1
      0
      1
      0

See Also

intersect, setdiff, setxor, union, unique, is*

iskeyword

isocaps