UP my solution

numpy_questions.py

@@ -37,10 +37,17 @@ def max_index(X):
         If the input is not a numpy array or
         if the shape is not 2D.
     """
+    if not isinstance(X,np.ndarray):
+        raise ValueError("Entry must be an np array")
+    if X.ndim != 2:
+        raise ValueError("Entry must be an np array of shape 2")
+
     i = 0
     j = 0
 
-    # TODO
+    X = np.array(X)
+
+    i, j = np.unravel_index(np.argmax(X), X.shape)
 
     return i, j
 
@@ -64,4 +71,13 @@ def wallis_product(n_terms):
     """
     # XXX : The n_terms is an int that corresponds to the number of
     # terms in the product. For example 10000.
-    return 0.
+
+    output = 1
+    if n_terms == 0:
+        return output * 2
+    else:
+        for i in range(1, n_terms + 1):
+            new_term = ((4 * i * i) / (4 * i * i - 1))
+            output = output * new_term
+
+        return output * 2