discrete-time (D-T) real exponentials subplot

I am having trouble understanding what to do for this problem. I have never used matlab before. Any guidance in a direction would be great. I attached the code that I tried

for n = 1:1:4
    z = [-2,-.5,.5,2];
    x = z.^n;
    subplot(2,2,n)
    stem(z,x) 
end 

Answer 1

[Sindar]

You're mixing the plot number up with the element of the series, try:

% set the discrete values for plotting (n in x[n])
n = 0:10;
% set the collection of z's for plots
z = [-2,-.5,.5,2];
% iterate over the subplots
for plot_n = 1:4
    % calculate x[n] for current z
    x = z(plot_n).^n;
    subplot(2,2,plot_n)
    % plot x[n] vs n
    stem(n,x)
    % title it with current z
    title(z(plot_n))
end