# Unique function of MATLAB--the uniqueness value of array matrix

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Author: User

Unique function of MATLAB--to find the uniqueness of array matrix

Related Mathwork documentation See this:unique values in a unique array

1 `C = unique(A)` . Returns the `A` same data as in, but does not contain duplicates. `C`have been sorted by small to large.

2. `C = unique(A,___,‘rows‘)` and `C = unique(A,‘rows‘,___)` `A` each row in is treated as a single entity, and `A` the unique row in the sort order is returned. Must be specified `A` , `setOrder` and `occurrence` is optional.

`‘rows‘`option does not support cellular arrays.

3, you `[C,ia,ic] = unique(___)` can also use any of the above syntax to return the index vector `ia` and `ic` .

• if  `a `   is a vector, then  `c = A (ia) `   and  `a = C (IC) `.

• if  `a `   is a matrix or array, then  `c = A (ia) `   and  `a (:) = C (IC) `.

• "rows"   option, then  `c = A (ia,:) `   and  `a = C (IC,:) `.

• if  `a `   is a table or timesheet, then  `c = A (ia,:) `   and  `a = C (IC,:) `.

4. `[C,ia,ic] = unique(A,‘legacy‘)` ,

`  [C,ia,ic] = unique(A,‘rows‘,‘legacy‘)`

`  [C,ia,ic] = unique(A,occurrence,‘legacy‘)`And

`  [C,ia,ic] = unique(A,‘rows‘,occurrence,‘legacy‘)`Preserves the behavior of functions in r2012b and earlier versions `unique` .

`‘legacy‘`The option does not support categorical arrays, datetime arrays, duration arrays, tables, or timesheets.

Only IA and ICS are returned:

Unique function of MATLAB--the uniqueness value of array matrix

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