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"This is my first time to use MATLAB.\r\nhow can i generate a square wave with a fundamental frequency of 50hz?\r\nThen how to obtain a plot that shows 20 periods of the square wave?"
<https://in.mathworks.com/matlabcentral/answers/253106-how-to-generate-a-square-wave-with-a-fundamental-frequency-of-50hz>