Impulse and step response

y(n)=(x(n)-3*x(n-1)+4*x(n-2)-2*x(n-3))/2 how do i find the impulse and step response of this system ? in matlab

Answer 1

[Wayne King]

   B  = [1/2 -3/2 2 -1];
   [h,t] = impz(B,1);
    [u,t] = stepz(B,1);

This is an FIR filter so the impulse response is just the filter coefficients.