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The below code in Matlab can generate a square wave.

fs = 1000;

t = 0:1/fs:1.5;

x1 = sawtooth(2*pi*50*t);

x2 = square(2*pi*50*t);

subplot(2,2,1),plot(t,x1), axis([0 0.2 -1.2 1.2])

xlabel('Time (sec)');ylabel('Amplitude'); title('Sawtooth Periodic Wave')

subplot(2,2,2),plot(t,x2), axis([0 0.2 -1.2 1.2])

xlabel('Time (sec)');ylabel('Amplitude'); title('Square Periodic Wave');

subplot(2,2,3),stem(t,x2), axis([0 0.1 -1.2 1.2])

xlabel('Time (sec)');ylabel('Amplitude');

The resultant wave has an amplitude of +1 to -1.

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