Done with the required changes

Author: Acuspeedster

maths/fibonacci.py

@@ -247,6 +247,27 @@ def matrix_pow_np(m: ndarray, power: int) -> ndarray:
 
     Returns:
         The matrix raised to the power.
+
+    Raises:
+        ValueError: If power is negative.
+
+    >>> m = np.array([[1, 1], [1, 0]], dtype=int)
+    >>> matrix_pow_np(m, 0)  # Identity matrix when raised to the power of 0
+    array([[1, 0],
+           [0, 1]])
+
+    >>> matrix_pow_np(m, 1)  # Same matrix when raised to the power of 1
+    array([[1, 1],
+           [1, 0]])
+
+    >>> matrix_pow_np(m, 5)
+    array([[8, 5],
+           [5, 3]])
+
+    >>> matrix_pow_np(m, -1)
+    Traceback (most recent call last):
+        ...
+    ValueError: power is negative
     """
     result = np.array([[1, 0], [0, 1]], dtype=int)  # Identity matrix
     base = m