Update README.md

Signed-off-by: David Rotermund <54365609+davrot@users.noreply.github.com>

numpy/stack_split/README.md

@@ -215,4 +215,65 @@ print(b.shape)  # -> (6, 8, 10, 2)
 b = np.stack((a, a), axis=4) # AxisError: axis 4 is out of bounds for array of dimension 4
 ```
 
+## [numpy.split](https://numpy.org/doc/stable/reference/generated/numpy.split.html) and [numpy.array_split](https://numpy.org/doc/stable/reference/generated/numpy.array_split.html)
+
+```python
+numpy.split(ary, indices_or_sections, axis=0)
+```
+
+> Split an array into multiple sub-arrays as **views** into ary.
+
+```python
+import numpy as np
+
+a = np.arange(0, 20).reshape(10, 2)
+print(a)
+print(a.shape)  # -> (10, 2)
+print()
+
+b = np.split(a, 2, axis=0)
+print(len(b))  # -> 2
+print(b[0])
+print(b[0].shape)  # -> (5, 2)
+print()
+print(b[1])
+print(b[1].shape)  # -> (5, 2)
+
+b = np.split(a, 3, axis=0)  # ValueError: array split does not result in an equal division
+```
+
+Output:
+
+```python
+[[ 0  1]
+ [ 2  3]
+ [ 4  5]
+ [ 6  7]
+ [ 8  9]
+ [10 11]
+ [12 13]
+ [14 15]
+ [16 17]
+ [18 19]]
+
+[[0 1]
+ [2 3]
+ [4 5]
+ [6 7]
+ [8 9]]
+
+[[10 11]
+ [12 13]
+ [14 15]
+ [16 17]
+ [18 19]]
+```
+
+```python
+numpy.array_split(ary, indices_or_sections, axis=0)
+```
+
+> Split an array into multiple sub-arrays.
+> 
+> The only difference between these functions is that array_split allows indices_or_sections to be an integer that does not equally divide the axis. For an array of length l that should be split into n sections, it returns l % n sub-arrays of size l//n + 1 and the rest of size l//n.