在Octave中绘制square（）和sawtooth（）

Question

I was trying to plot a square wave and a saw-tooth wave in Octave, but it gave an error saying

>>>error: 'sawtooth' undefined near line 17 column 6
error: 'square' undefined near line 17 column 6
>>>error: 'x1' undefined near line 17 column 21
error: evaluating argument list element number 2
>>>error: 'x2' undefined near line 18 column 21
error: evaluating argument list element number 2

Then I read up on internet, and came to know that I have to install some packages. I installed the necessary packages and also their respective dependencies. In spite of doing that, it did not make a difference. The same error persisted. I then installed all the packages from the online repositories. Again that made no difference.

I ran the same code in Matlab and it worked! (I know it comes bundled with all the packages).

But I don't really get the problem I am facing in Octave. I use the QtOctave interface and there is a option there to install packages. Is there some way to check for installed packages? Are they actually getting installed?

I tried the same code in FreeMat and it gave some error there too.

Here is my code:

% program to plot a saw tooth and square wave
fs = 10000;
t = 0:1/fs:1.5;
x1 = sawtooth(2*pi*50*t);
x2 = square(2*pi*50*t);
subplot(211);plot(t,x1);axis([0 0.2 -1.2 1.2]);
xlabel('Time (sec)');ylabel('Amplitude');title('Sawtooth Periodic Wave');
subplot(212);plot(t,x2);axis([0 0.2 -1.2 1.2]);
xlabel('Time (sec)');ylabel('Amplitude');title('Square Periodic Wave');
set(gcf,'Color',[1 1 1]);

Please help me to get this code to work on Octave.

Answer 1

Works for me. See https://saturnapi.com/fullstack/plotting-square-and-sawtooth-in-octave

If you're using Ubuntu, make sure to install the necessary package a la

sudo apt-get -q -y install octave-signal

Answer 2

Have you actually loaded the packages of interest? Even though the packages are installed, they may not be loaded into your particular Octave session. You can do this by typing pkg load <package_name> at the Octave prompt replace <package_name> by the corresponding paccage name.