How to create a square wave pulse

How do I create a square wave pulse, I don't really mind the gap between pulses but it must go on for 10ms. I dont mind the freauency or anything I just want to know how to create a square wave pulse that happens say 3 times in the 10ms

Answer 1

[Star Strider]

Without the Signal Processing Toolbox:

t = linspace(0, 10E-3);                                 % Time Vector (0 - 10ms)
f = 3/max(t);                                           % Desired Frequency (Cycles/Timespan)
sqwv = sign(sin(2*pi*t*f));                             % Signal

figure
plot(t, sqwv, 'LineWidth',1.5)
grid
ylim(ylim*1.1)
xlabel('Time (s)')
ylabel('Amplitude')

producing:

.

Answer 2

[Ameer Hamza]

If you have signal processing toolbox

T = 0.01; % 10 milliseconds timeperiod, 1 square wave in 10 milliseconds
t = linspace(0, T*10, 1000);
y = square(t/T*2*pi);

plot(t, y);

If you want to generate the waveform in Simulink, then you can use a pulse generator block and use the following settings.