From 07bf4dd93131425888a2c816050e40ec90b94175 Mon Sep 17 00:00:00 2001
From: Maor <mmaorc@gmail.com>
Date: Sun, 30 Sep 2018 18:21:22 +0300
Subject: [PATCH] Fixed 'Toy Story' movie average calculation bug  in Ex8. The
 indicator matrix should be used for filtering elements instead of selecting
 elements.

---
 Exercise8/exercise8.ipynb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Exercise8/exercise8.ipynb b/Exercise8/exercise8.ipynb
index 3e4aa60..c47efd2 100755
--- a/Exercise8/exercise8.ipynb
+++ b/Exercise8/exercise8.ipynb
@@ -469,7 +469,7 @@
     "\n",
     "# From the matrix, we can compute statistics like average rating.\n",
     "print('Average rating for movie 1 (Toy Story): %f / 5' %\n",
-    "      np.mean(Y[0, R[0, :]]))\n",
+    "      np.mean(Y[0, R[0, :] == 1]))\n",
     "\n",
     "# We can \"visualize\" the ratings matrix by plotting it with imshow\n",
     "pyplot.figure(figsize=(8, 8))\n",