How to make a piecewise function without using syms?

I am trying to plot the following piecewise function without using syms but it plots as a horizontal line. This is the code I'm using. The issue isn't the <=, I have tried several different combinations of them (0<=n && n<=4, 0<=n & n<=4, 0<=n<=4) and the code still does not work.

dt = .1;
n = -31:dt:31;
for ii = 1:length(n)
    if 0<=n<=4
        x(ii) = n(ii)./4;
    elseif 4<n<8
        x(ii) = 2-(n(ii)./4);
    else
        x(ii) = 0;
    end
end

Answer 1

[Mathieu NOE]

hello Brianna

try this (using logical arrays)

n = 0:20;
x = zeros(size(n)); % cond 3 by default

% cond 1
ind1 = (0<=n & n<=4);
x(ind1) = n(ind1)/4;

% cond 2
ind2 = (4<n & n<8);
x(ind2) = 2-n(ind2)/4;

plot(n,x);

[Mathieu NOE]

hello Brianna

problem solved?

[Ekin]

it's been like 3 years since your comment apparently but i wanted to thank you this code helped me a lot :)

[Mathieu NOE]

@Ekin

glad it helped you :)