problems using for loop

%PULSE GENERATION
for k=1:length(t)
    if mod(t(1,k),ts) == 0
        pulse1(1,k) = 1
    else
        pulse1(1,k) = 0
    end
end

here is a code snippet written by me for generating a pulse i have taken ts = 0.02 and t = 1:0.0001:2 for a project but when ever I run this programme it just keeps on looping. But sometimes its stops and shows a blizzare graph which is not at all looks like a pulses. I use Matlab R2018a

%PULSE GENERATION
for k=1:length(t)
  if mod(t(1,k),Ts)==0
      pulse(1,k)=1 %PULSE
  else
      pulse(1,k)=0;
  end 
end 

while this above code written by my friend is completely fine and runs smoothly.

What is the difference between these two code snippets apart from the intendation? What problem lies in the intendation of the programme?

Answer 1

[Bruno Luong]

Both codes are flawed, this statement is flawed (neverr compare floating points with "==")

if mod(t(1,k),Ts) == 0

You should replace with something like

dt =0.0001; % your time step dt=mean(diff(t))
for ...
    tk = t(1,k);
    tdiff = tk-ceil(tk/Ts)*Ts;
    if tdiff+dt > 0
        ...
    else
        ...
    end
end