From 2d6da3e3d4867546eb49c11184eef3de72c9057f Mon Sep 17 00:00:00 2001
From: neingeist <neingeist@bl0rg.net>
Date: Thu, 6 Nov 2014 01:12:38 +0100
Subject: [PATCH] Regularized linear regression gradient

---
 ex5/linearRegCostFunction.m | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ex5/linearRegCostFunction.m b/ex5/linearRegCostFunction.m
index 1d70418..e90732b 100644
--- a/ex5/linearRegCostFunction.m
+++ b/ex5/linearRegCostFunction.m
@@ -22,6 +22,8 @@ grad = zeros(size(theta));
 J =   1/(2*m) * sum(((X*theta)-y).^2) ...
     + lambda/(2*m) * sum(theta(2:end).^2);
 
+grad = 1/m * X' * ((X*theta)-y) + (lambda/m) * [0; theta(2:end)];
+
 % =========================================================================
 
 grad = grad(:);