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Regularized linear regression gradient

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neingeist 2014-11-06 01:12:38 +01:00
parent 6530916642
commit 2d6da3e3d4
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ex5/linearRegCostFunction.m
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@ -22,6 +22,8 @@ grad = zeros(size(theta));
J = 1/(2*m) * sum(((X*theta)-y).^2) ... J = 1/(2*m) * sum(((X*theta)-y).^2) ...
+ lambda/(2*m) * sum(theta(2:end).^2); + lambda/(2*m) * sum(theta(2:end).^2);
grad = 1/m * X' * ((X*theta)-y) + (lambda/m) * [0; theta(2:end)];
% ========================================================================= % =========================================================================
grad = grad(:); grad = grad(:);