function modelmat=creat_u_d_model

th=linspace(0,2*pi,17);
th=th(1:16);
for a=1:length(th)
    for b=1:length(th)
    dife=(abs(angdiff(th(a),th(b)))); %minor difference since we are using euclidean distance
    m0(a,b)=abs((angdiff(th(a),th(b)))); %minor difference since we are using euclidean distance

    if th(a)>=0.5*pi&th(a)<1.5*pi
        if th(b)>=0.5*pi&th(b)<1.5*pi
            modelmat(a,b)=0;
        else
            modelmat(a,b)=1;
        end
    else
    if th(b)>=0.5*pi&th(b)<1.5*pi
            modelmat(a,b)=1;
        else
            modelmat(a,b)=0;
        end    
    end
    end
end


end