Coursera机器学习 week2 assignment
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warmUpExercise.m:
A = eye(5);
plotData.m:
plot(x,y,'rx','markersize',10);xlabel('Population of City in 10,1000s');ylabel('Profit in $10,1000s');
J = (1/(2*m))*sum((X*theta-y).^2);
theta = theta - alpha*(1/m)*(X' * (X*theta-y))
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