Q6b ML Assignment 2

Q6b.m

data = importdata('breastCancer.csv',',');

[n,m] = size(data);

epsilon = 1e-1;

%x(1:n,1:m-1) = 0;
y(1:n,1:1) = 0;
a = 0.1;
%t(1:n,1:1) = 0;
w_old = zeros(m-1,1);

t = data(:,1);
x = data(:,2:m);

for i = 1:n
    y(i,1) = 1.00/(1+exp(-(x(i,1:m-1)*w_old)));
end

deltaf = transpose(x)*(y-t);

disp(deltaf);

j=1;

while norm(deltaf)>epsilon && j<20
	w_old = w_old-a*deltaf;
    for i = 1:n
        y(i,1) = 1.00/(1+exp(-(x(i,1:m-1)*w_old)));
    end
    deltaf = transpose(x)*(y-t);
    j=j+1;
end