완료

ex3/lrCostFunction.m

@@ -36,10 +36,11 @@ grad = zeros(size(theta));
 %           grad = grad + YOUR_CODE_HERE (using the temp variable)
 %
 
+hx = sigmoid(X*theta);
+%J = sum(-y.*log(hx)-(1.-y).*log(1.-hx))/m + lambda*sum([0; theta(2:end)].^2)/(2*m);
+J = (-y'*log(hx)-(1.-y)'*log(1.-hx))/m + lambda*sum([0; theta(2:end)].^2)/(2*m);
 
-
-
-
+grad = X'*(hx-y)/m + lambda*[0; theta(2:end)]/m;