Need helps with my unit step function

So I wanted to create a unit step function that contain a time vector that specifies the finite range of the signal and a time shift value, which is equivalent to u(t + ts). But every time I tried to run the function, it did not work as I expected. The reason I believe it did not work was because of time vector in a function. I do not know how to make a time vector that can set a finite range by inputing any integer. I would be much thankful if anyone can help me. Here is my code I have problem with.

function [y] = unitstep(t, ts)
for i = -t:t
    y = zeros(size(i));
    if i >= ts
        y = 1;
    elseif i < ts
        y = 0;
    end
end

Answer 1

[Rik]

Your current code overwrites your output on every iteration. It looks like this is what you want:

function [y] = unitstep(t, ts)
t=-t:t;%only works if t is a scalar
y = zeros(size(t));
for ind = 1:numel(t)
    if ind >= ts
        y(ind) = 1;
    else
        y(ind) = 0;
    end
end

Which can be simplified to this:

function [y] = unitstep(t, ts)
t=-t:t;%only works if t is a scalar
y=zeros(size(t));
y(y>=ts)=1;