How to plot a piecewise in MATLAB?

I have this piecewise function and I have to plot this discrete signal using the stem function. This is what I wrote:

And this is the error I am getting:

What is it that I am doing wrong?

[Siddharth Garg]

Note- In the 10th line, it should be: x<=-1

Answer 1

[Star Strider]

I prefer the anonymous function approach:

x = @(n) n.*((0<=n) & (n<=8)) + 1*((-4<=n) & (n<=-1));

n = -10:12;

figure
stem(n, x(n))
grid