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

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

Answer 1

[Dr. Seis]

If you dont have the Signal Processing Toolbox, will the following work as an alternative:

y = sign(sin(2*pi*100*t));

[Jenn Mariel Biso]

Thank you for this.

[venkata santhoshnaidu koribilli]

Dr.seis

appriciate your code which work to me since last 4 hours strugling.

square_wave_f=A/2 + A/2*square(2*pi*t/T);

square_wave_f=A/2 + A/2*sign(sin(2*pi*t/T)); worked

Thanks

[Nanduri kunkuma Sri kamaladevi]

Tq sir

[hajar]

thanks

[Arabinda]

Thank you sir

Answer 2

[Wayne King]

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]

Also

which -all square

should return something like

.../toolbox/signal/signal/square.m

Answer 3

[Daniel Shub]

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.

[Dr. Seis]

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]

@Elige, you are correct. Thank you for the fix, my answer is sloppy and wrong.