Fix minor typo and add matrix dimension check (#6367)

* Fix minor typo in comment

* Add matrix dimension check

* Add descriptive comment

Author: ybrenning

matrix/inverse_of_matrix.py

@@ -27,14 +27,21 @@ def inverse_of_matrix(matrix: list[list[float]]) -> list[list[float]]:
     [[0.25, -0.5], [-0.3, 1.0]]
     """
 
-    D = Decimal  # An abbreviation to be conciseness
+    D = Decimal  # An abbreviation for conciseness
+
+    # Check if the provided matrix has 2 rows and 2 columns, since this implementation only works for 2x2 matrices
+    if len(matrix) != 2 or len(matrix[0]) != 2 or len(matrix[1]) != 2:
+        raise ValueError("Please provide a matrix of size 2x2.")
+
     # Calculate the determinant of the matrix
     determinant = D(matrix[0][0]) * D(matrix[1][1]) - D(matrix[1][0]) * D(matrix[0][1])
     if determinant == 0:
         raise ValueError("This matrix has no inverse.")
+
     # Creates a copy of the matrix with swapped positions of the elements
     swapped_matrix = [[0.0, 0.0], [0.0, 0.0]]
     swapped_matrix[0][0], swapped_matrix[1][1] = matrix[1][1], matrix[0][0]
     swapped_matrix[1][0], swapped_matrix[0][1] = -matrix[1][0], -matrix[0][1]
+
     # Calculate the inverse of the matrix
     return [[float(D(n) / determinant) or 0.0 for n in row] for row in swapped_matrix]