You must first make a matlab function or script to evaluate your y(x) and then plot your values
So something like
% define constants (put your values here)
a =
b =
x = linspace(0,10) % makes x values
y = zeros(size(x)) % preallocate y value
% loop to evaluate y
for k = 1:length(x)
if x(k) > b + a
y(k) = 1
elseif x(k) >= b - a
% and so on
end
end
% finally plot your values
plot(x,y)
