UP my solution

Author: RomeoCorrec

numpy_questions.py

@@ -37,10 +37,27 @@ def max_index(X):
         If the input is not a numpy array or
         if the shape is not 2D.
     """
+    # Vérification de la validité de X
+    if X is None:
+        raise ValueError("Input cannot be None.")
+
+    if not isinstance(X, np.ndarray):
+        raise ValueError("Input must be a numpy array.")
+
+    if X.ndim != 2:
+        raise ValueError("Input must be a 2D numpy array.")
+
     i = 0
     j = 0
 
+    n_samples, n_features = X.shape
+    max = 0
     # TODO
+    for l in range(n_samples):
+        for c in range(n_features):
+            if X[l, c] > max:
+                max = X[l, c]
+                i, j = l, c
 
     return i, j
 
@@ -64,4 +81,10 @@ 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.
+    if n_terms == 0:
+        return 2
+
+    aprox = 2
+    for n in range(1, n_terms + 1):
+        aprox *= (4*n**2) / (4*n**2 - 1)
+    return aprox