Calculate cost function

Merouane Atig · Merouane Atig · commit 23e31fc81e02 · 2011-11-17T21:56:04.000+01:00
diff --git a/mlclass-ex5/linearRegCostFunction.m b/mlclass-ex5/linearRegCostFunction.m
@@ -19,9 +19,9 @@
 %               You should set J to the cost and grad to the gradient.
 %
 
-
-
-
+htheta = X * theta;
+n = size(theta);
+J = 1 / (2 * m) * sum((htheta - y) .^ 2) + lambda / (2 * m) * sum(theta(2:n) .^ 2);
 
 
 

Original file line number	Diff line number	Diff line change
`@@ -19,9 +19,9 @@`
`19`	`19`	`% You should set J to the cost and grad to the gradient.`
`20`	`20`	`%`
`21`	`21`
`22`		`-`
`23`		`-`
`24`		`-`
	`22`	`+htheta = X * theta;`
	`23`	`+n = size(theta);`
	`24`	`+J = 1 / (2 * m) * sum((htheta - y) .^ 2) + lambda / (2 * m) * sum(theta(2:n) .^ 2);`
`25`	`25`
`26`	`26`
`27`	`27`