I cant generate a square wave in matlab using the square wave command

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Rapheal
Rapheal 2012-5-16
评论： Arabinda 2024-1-8
hello, i tried to create a square wave using the following command:
t = 0:0.001:0.1; y = square(2*pi*100*t,50); plot(t,y); axis([0 0.1 -1.5 1.5]); xlabel('Seconds'); ylabel('Amplitude');
i keep getting an error with the square wave:
error message: Error in Untitledsqwave (line 2) y = square(2*pi*100*t,50);
is there an error because i dont have the signal processing toolbox. and what command can i use to see if i have the signal processing toolbox.
thanks

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回答（3 个）

Dr. Seis
Dr. Seis 2012-5-16
If you dont have the Signal Processing Toolbox, will the following work as an alternative:
y = sign(sin(2*pi*100*t));
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Wayne King
Wayne King 2012-5-16
You can enter
>>ver
at the command line to see what is installed. If you see the Signal Processing Toolbox listed try:
license('test','signal_toolbox')
to see if you have a license checked out
Daniel Shub
Daniel Shub 2012-5-16
You can get similar functionality with
square = @(M, N, duty)repmat([ones(floor(N/duty), 1); -ones(ceil(N/duty), 1)], M, 1);
where M is the number of periods, N is the samples per period, and duty is the duty cycle.
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Dr. Seis
Dr. Seis 2012-5-16
I wasn't able to get similar functionality without some modifications. I.e.,
squarez = @(M, N, duty)repmat([ones(floor(N*duty/100), 1); -ones(ceil(N*(100-duty)/100), 1)], M, 1);
Daniel Shub
Daniel Shub 2012-5-18
@Elige, you are correct. Thank you for the fix, my answer is sloppy and wrong.

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