How to step through a discrete model simulation one step at a time

I have a discrete-time ARX model that I want to use to represent the plant in a simulation:

Ts = 1;
sigma = 0.01;
d = 3;
sys = idpoly([1 -2.4 1.9 -0.5],[0.01 0.001 -0.007],[],[],[],sigma^2,Ts,'IOdelay',d);

How do I simulate this system one timestep at a time in a for loop with my control algorithm?

N = 10;
u = zeros(N,1);
y = zeros(N,1);
for k=1:N
    u[k] = rand()*2 - 1;
    y[k] = sys ...?
end

(I know how to simulate a whole trajectory):

u = rand(N,1)*2 -1;
y = sim(sys,u);

Answer 1

[Navya Seelam]

sim function doesn't support onetime step simulation as of now. I have brought this issue to the concerned people and it might be considered in any future release.

[Bill Tubbs]

That would be nice. Especially for those working with adaptive control schemes.