Invalid use of operator

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Xeven
Xeven 2022-12-19
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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Fifteen12
Fifteen12 2022-12-19
Ran in:
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!
  1 个评论
Xeven
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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更多回答（2 个）

Image Analyst
Image Analyst 2022-12-19
Ran in:
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;
Rik
Rik 2022-12-19
移动：Image Analyst 2022-12-19
This is not Matlab code. What language is this?
If you have trouble with Matlab basics you may consider doing the Onramp tutorial (which is provided for free by Mathworks).
  1 个评论
Xeven
Xeven 2022-12-19
Open ai chat gpt I forget all these codes aren't universal. Back to the onramp 🐢

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