[Term Entry] NumPy Ndarray: .sort()

content/numpy/concepts/ndarray/terms/sort/sort.md

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+---
+Title: '.sort()'
+Description: 'Sorts the array in-place along the specified axis.'
+Subjects:
+  - 'Code Foundations'
+  - 'Computer Science'
+Tags:
+  - 'Arrays'
+  - 'Elements'
+  - 'Methods'
+  - 'NumPy'
+CatalogContent:
+  - 'learn-python-3'
+  - 'paths/computer-science'
+---
+
+The **`.sort()`** method sorts a NumPy [array](https://www.codecademy.com/resources/docs/numpy/ndarray) in-place in ascending order along a specified axis. It modifies the original array and does not return a new one.
+
+## Syntax of Numpy `.sort()`
+
+```pseudo
+ndarray.sort(axis=-1, kind=None, order=None)
+```
+
+**Parameters:**
+
+- `axis`: Axis along which to sort. Default is `-1` (last axis). Use `None` to sort the flattened array.
+- `kind`: Sorting algorithm: `'quicksort'` (default), `'mergesort'`, `'heapsort'`, or `'stable'`.
+- `order`: Only for structured arrays. Specifies the field(s) to sort by.
+
+## Example
+
+In this example, the `.sort()` method is used to sort a NumPy array in descending order:
+
+```py
+# Import NumPy
+import numpy as np
+
+# Create a NumPy array
+nf = np.array(['aaa', 'xxx', 'ddd', 'sss'])
+
+# Sort in descending order
+nf.sort()     # Sorts in ascending order
+nf = nf[::-1] # Reverses to get descending order
+
+print(nf)
+```
+
+The above code will result in the following output:
+
+```shell
+['xxx' 'sss' 'ddd' 'aaa']
+```
+
+## Codebyte Example
+
+In the following codebyte example, a NumPy array `nf` is created with integers, sorted in ascending order using NumPy's `.sort()` method, and then reversed to display the values in descending order:
+
+```codebyte/python
+import numpy as np
+
+nf = np.array([5, 1, 9, 3, 2, 8])
+
+# Sort the array in-place using NumPy's sort method
+nf.sort()
+print("Ascending:", nf)
+
+# Reverse for descending order
+nf = nf[::-1]
+print("Descending:", nf)
+```