diff --git a/ex1/featureNormalize.m b/ex1/featureNormalize.m
index be3507f..74039c2 100644
--- a/ex1/featureNormalize.m
+++ b/ex1/featureNormalize.m
@@ -26,9 +26,18 @@ sigma = zeros(1, size(X, 2));
 % Hint: You might find the 'mean' and 'std' functions useful.
 %
 
+mu = mean(X);
+sigma = std(X);
 
+% This gives broadcasting warnings, but works, too:
+%
+%   X_norm = (X - mu) ./ sigma;
+%
+% warning: operator -: automatic broadcasting operation applied
+% warning: quotient: automatic broadcasting operation applied
 
 
+X_norm = bsxfun(@rdivide, bsxfun(@minus, X, mu), sigma);
 
 % ============================================================