Filter command in matlab with only input system

By using only this input, z(n); how could I calculate the output by using filter command in matlab.

Answer 1

[Birdman]

Why don't you define this function with piecewise command very easily?

syms z(n)
z(n)=piecewise(n>=1 & n<=5,n,n<1 | n>5,0);

and plot it to see the results.

t=0:0.01:7;
plot(t,z(t))