How to create a square wave signal

I have to create a square wave of amplitude 0.19 and period 495 samples and I don't know how to do. I just have understood that in Matlab there is the command x=square(t) but I really don't know how to represent my period and my amplitude. Could someone help me please?

[Jonas]

per period you want 495 samples and which frequency do you want?

[KSSV]

https://in.mathworks.com/matlabcentral/answers/378709-how-to-generate-square-wave-in-matlab-with-frequency-amplitude-voltage-offset-dutycycle

[Benedetta Bonini]

I don't know the frequency, I just have amplitude and period... but isn't frequency=1/period?

[Jonas]

yes and no. samples per period refers to sampling frequency. normally you want a frequency e.g. of 2 Hz, which means 2 per second. during that second the signal is sampled several times which refers to the sampling frequency

[Adam Danz]

This answer demonstrates a parameterized step function but you need to know the period and what you're describing is the number of samples within a period.

https://www.mathworks.com/matlabcentral/answers/796282-how-do-i-make-this-square-wave-graph#answer_670442

Answer 1

[Scott MacKenzie]

Here's a brute-force solution. It's a bit odd, but it does create a square wave according to your specs (with one extra sample to round out the math):

amplitude = 0.19;
samples = 496; 

y = [ones(1,samples/2)*amplitude/2, ones(1,samples/2)*amplitude/2*-1];
plot(y);

Just having a bit of fun with this. The code below adds a variable cycles to output >1 cycle, if desired.

amplitude = 0.19;
samples = 496; % per cycle
cycles = 5;

y = [ones(1,samples/2)*amplitude/2, ones(1,samples/2)*amplitude/2*-1];
y = repmat(y, 1, cycles);
plot(y);

Here's a more compact and concise approach... (same output as above)

amplitude = 0.19;
samples = 496; 
cycles = 5;

y = repmat([amplitude/2 -amplitude/2], samples/2, cycles);
y = y(:);
plot(y);

[Benedetta Bonini]

thank you so much!