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curve_fitting/cost_logistic.m

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sigma(t) = 1/(1+e^-t)
t = a0+a1
options = optimset('GradObj', 'on', 'MaxIter', 400);
[theta, cost]
fminunc(@(a)(costFunction(a,x,y)),initial_1,options);
plot(x,y,x, sigma(a(1)+a(2)*x))