From 835a42b07bbb9ada1228c15f4f7856c25f92d567 Mon Sep 17 00:00:00 2001
From: David Rotermund <54365609+davrot@users.noreply.github.com>
Date: Thu, 14 Dec 2023 16:21:04 +0100
Subject: [PATCH] Update README.md

Signed-off-by: David Rotermund <54365609+davrot@users.noreply.github.com>
---
 numpy/bool_matrix/README.md | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/numpy/bool_matrix/README.md b/numpy/bool_matrix/README.md
index cef8a70..6b9a0b3 100644
--- a/numpy/bool_matrix/README.md
+++ b/numpy/bool_matrix/README.md
@@ -128,6 +128,32 @@ Output:
 (array([0, 1, 1, 1]), array([2, 0, 1, 2]))
 ```
 
+For reversing it, you can use this:
+
+```python
+import numpy as np
+
+a = np.arange(0, 6).reshape((2, 3))
+a = (a > 1)
+print(a)
+idx = np.nonzero(a)
+print()
+
+b = np.zeros((2, 3), dtype=bool)
+b[idx] = True
+print(b)
+```
+
+Output: 
+
+```python
+[[False False  True]
+ [ True  True  True]]
+
+[[False False  True]
+ [ True  True  True]]
+```
+
 ## [Logic functions](https://numpy.org/doc/stable/reference/routines.logic.html)
 
 ### [Truth value testing](https://numpy.org/doc/stable/reference/routines.logic.html#truth-value-testing)