it's plotting empty figures

i'm trying to plot two figures but it's plotting empty figure.

[Bhaskar R]

Actually it is not a problem of empty figures, there are errors. Code is wrong.

Answer 1

[Daniel M]

I made some adjustments. Let me know if this is close to what you want.

tau = [1.5, 2];
figure
for t = 1:length(tau)
  % create new vector tt (don't overwrite t)
  tt = -tau(t):0.01:tau(t); % index tau at t
  x = @(z) heaviside(z+tau(t)/2)-heaviside(z-tau(t)/2); 
  % use z for clarity, since the input variable doesn't need to be named t as well
  subplot(1,2,t) 
  grid minor
  plot(tt,x(tt)) % evaluate x at tt
end

[Alex]

that's really helpful thank you.

Answer 2

[Walter Roberson]

Change the

plot(t,x(t))

to

plot(t,x(t),'*')

I admit that I am surprised that subplot() did not give you an error about illegal subplot number, as you are constructing t as a vector of numeric values that are seldom positive integers. Notice that your line assigning t= -tau:0.01:tau is overwriting the t of your for t loop...