unique
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Name

unique — extract unique components of a vector or matrices

Calling Sequence

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

Parameters

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

union, intersect, gsort, lex_sort
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