unique

Arguments

M

vector or matrix of numbers or strings

orient

flag with possible values : 1 or "r", 2 or "c"

N

vector or matrix of numbers or strings

k

vector of integers

Description

unique(M) returns a vector which retains the unique entries of M in ascending order.

unique(M,"r") or unique(M,1)returns the unique rows of M in lexicographic ascending order.

unique(M,"c") or unique(M,2)returns the unique columns of M in lexicographic ascending order.

If required the output argument k contains the position of the first encountered unique entries.

Examples

M = round(2*rand(20,1));

unique(M)
[N,k] = unique(M)

unique(string(M))
[N,k] = unique(string(M))

A = [0,0,1,1;
     0,1,1,1;
     2,0,1,1;
     0,2,2,2;
     2,0,1,1;
     0,0,1,1];
T = 'x'+string(A);

//unique rows

[m,k] = unique(A,'r')
unique(T,'r')

//unique columns
[m,k] = unique(T,'c')
unique(A,'c')

See also

• members — count (and locate) in an array each element or row or column of another array
• gsort — sorting by quick sort algorithm
• union — extract union components of a vector
• intersect — returns the vector of common values of two vectors