a=[0.1, 1.1;0.4, 2.1;1.0, 0.8; - Anonymous - m2bc2434c

a=[0.1, 1.1;0.4, 2.1;1.0, 0.8;1.0, 1.6;1.2, 1.2;1.3, 1.6;1.5, 1.5;1.5, 2.2;1.8, 1.1;2.1, 2.0]
b=[1.7, 1.8;2.0, 2.2;2.1, 3.0;2.5, 1.5;3.0, 2.3;3.2, 2.8;3.5, 1.5;3.7, 2.4;3.8, 3.4;4.5, 1.4]

//build the mode of apple
mA=zeros(1,2);
for m=1:10,
mA=a(m,:)+mA;
end
mA=mA/10;
CA=zeros(2,2);
for m=1:10,
CA=CA+(a(m,:)-mA)'*(a(m,:)-mA);
end
CA=CA/9;
//build the model of orange
mB=zeros(1,2);
for m=1:10,
mB=b(m,:) + mB;
end
mB=mB/10;
CB=zeros(2,2);
for m=1:10,
CB=CB+(b(m,:)-mB)'*(b(m,:)-mB);
end
CB=CB/9;

//calculating P(unknown)
c = [1.2, 2.1; 2.6, 1.8; 1.9, 1.9];
function[pdf]=P(class, cov, mea);
pdf =(1/(2 * %pi * det(cov)^1/2)) ^ (-1/2*(class-mea )� * det(cov) * (class-mea));
endfunction

for m=1:3,
if P(c(m,:), CA, mA) > P(c(m,:), CB, mB) then
printf("%g, %g is Apple\n", c(m,1), c(m,2) );
else
printf("%g, %g is Orange\n", c(m,1), c(m,2) );
end
end