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Address TODO for sort order in the output of unique() #104

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Jan 26, 2021
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Address TODO for sort order in the output of unique() #104

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12 changes: 5 additions & 7 deletions spec/API_specification/set_functions.md
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Expand Up @@ -13,7 +13,7 @@ A conforming implementation of the array API standard must provide and support t
<!-- NOTE: please keep the functions in alphabetical order -->

(function-unique)=
### unique(x, /, *, return_counts=False, return_index=False, return_inverse=False, sorted=True)
### unique(x, /, *, return_counts=False, return_index=False, return_inverse=False)

Returns the unique elements of an input array `x`.

Expand All @@ -35,12 +35,6 @@ Returns the unique elements of an input array `x`.

- If `True`, the function must also return the indices of the unique array that reconstruct `x`. Default: `False`.

- **sorted**: _bool_

- If `True`, the function must sort the unique elements in ascending order before returning as output. If `False`, the function must sort the unique elements in the same order that they occur in `x`. Default: `False`.

_TODO: sort order needs discussion. See [gh-40](https://github.com/data-apis/array-api/issues/40)_

#### Returns

- **out**: _Union\[ &lt;array&gt;, Tuple\[ &lt;array&gt;, ... ] ]_
Expand All @@ -51,6 +45,10 @@ Returns the unique elements of an input array `x`.

- an array containing the set of unique elements in `x`. The returned array must have the same data type as `x`.

```{note}
The order of elements is not specified, and may vary between implementations.
```

- **indices**: _&lt;array&gt;_

- an array containing the indices (first occurrences) of `x` that result in `unique`. The returned array must have the default array index data type.
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