function y = system_3(x)
% clip outside of range [-1,1]
range = 1.0;
N = length(x);
n = 1:1:N;
y = x;
ul = range*ones(1,N);
ll = -range*ones(1,N);
sup_ul = x > ul;
sup_ll = x < ll;
y(sup_ul) = ul(sup_ul);
y(sup_ll) = ll(sup_ll);

