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See the recommended documentation of this function

# unique

remove all duplicate components of a vector or a matrix

### Syntax

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

### 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

### Comments

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