Invalid use of operator

Question

Xeven 2022-12-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1881262-invalid-use-of-operator

评论： Xeven 2022-12-19

Completely new to coding...I put in this

\draw plot[domain=0:7, samples=200] (\x, {0.5*sin(deg(2*pi*\x))});. And Matlab says invalid use of operator what am I doing wrong, it might help if the program would highlight what it doesn't like...Thanks

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Answer 1

Fifteen12 2022-12-19

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https://ww2.mathworks.cn/matlabcentral/answers/1881262-invalid-use-of-operator#answer_1131517

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As Rik mentioned, this is not the correct language. MATLAB (like other programming environments/languages) has a strict syntax that you need to learn in order to use it.

I'm guessing at what you're trying to do, but a valid MATLAB command would be in the form of:

x = linspace(0, 7, 200);

y = 0.5 * sin(2*pi*x);

plot(x, y)

The error invalid use of operater came about because you were using the \ operator in a non-prescribed manner (in a way different than the way MATLAB defines the usage of the \ operator).

If you want to do more than just the simple plot command, then I would echo @Rik's advice to use the Onramp tutorial. It's slow going at first, but with great benefits once you learn it!

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Xeven 2022-12-19

编辑：Xeven 2022-12-19

Cool I'll get back in the on ramp. I should have realized the language is different with different applications/programs. I had just opened the Open ai chat gpt app and entered draw a sine wave. It gave the code above. I didn't know where else to try it out except for Matlab. Thanks for the info and help.

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Answer 2

Image Analyst 2022-12-19

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https://ww2.mathworks.cn/matlabcentral/answers/1881262-invalid-use-of-operator#answer_1131637

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You need to specify MATLAB in your request to chatbot. Something like "Write a MATLAB program to draw a sine wave" and you should get something like this:

x = linspace(0, 7, 200);

period = pi/2;

y = 0.5 * sin(2 * pi * x / period);

plot(x, y, 'b-', 'LineWidth', 2)

fontSize = 20;

xlabel('x', 'FontSize', fontSize);

ylabel('y', 'FontSize', fontSize);

title('Sine Wave', 'FontSize', fontSize);

grid on;