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Compute the cost function for logistic regression

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neingeist 2014-10-14 07:40:42 +02:00
parent b863a3863e
commit 8c100a3f49
1 changed files with 2 additions and 2 deletions
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ex2/costFunction.m
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@ -7,7 +7,7 @@ function [J, grad] = costFunction(theta, X, y)
% Initialize some useful values % Initialize some useful values
m = length(y); % number of training examples m = length(y); % number of training examples
% You need to return the following variables correctly % You need to return the following variables correctly
J = 0; J = 0;
grad = zeros(size(theta)); grad = zeros(size(theta));
@ -19,7 +19,7 @@ grad = zeros(size(theta));
% %
% Note: grad should have the same dimensions as theta % Note: grad should have the same dimensions as theta
% %
J = 1/m * (-y'*log(sigmoid(X*theta)) - (1-y)'*log(1-sigmoid(X*theta)));