function preclass=rule(b);
preclass=0;
pp=count(class_train(:,1));
if cla_point==0
    preclass=1;
else if cla_point_0==0
        p_0=count(class_0(:,1));
        if p_0>pp
            preclass=1;
        else
            preclass=0;
        end
    else if cla_point_