Error in equation/variables

Question

Afnan Mussa 2021-4-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/791179-error-in-equation-variables

评论： Image Analyst 2021-4-3

I'm facing a small problem in MATLAB, this code I wrote is not running due to an error in line 11 (the first equation in the image attached below).

I am not sure if i should write a0 in global or not, a0 is constant and equals 1.

How can I fix this error?

here is the code

and these are the errors

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Afnan Mussa 2021-4-2

Thank you all.

I am still having an error in teh dispaly figure line

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Answer 1

Image Analyst 2021-4-2

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https://ww2.mathworks.cn/matlabcentral/answers/791179-error-in-equation-variables#answer_665459

Theta is a vector so you need to decide if you want to do Theta(1)^2, Theta(2)^2 or Theta.^2 (using a dot).

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Afnan Mussa 2021-4-2

I got it. Thank you.

Image Analyst 2021-4-3

And next time, if you post actual code rather than an image of it, we can fix it for you.

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Answer 2

Sulaymon Eshkabilov 2021-4-2

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/791179-error-in-equation-variables#answer_665464

在 MATLAB Online 中打开

% You need to perform elementwise operation. Since Theta = [0, 120]
Theta^2  % must be
Theta.^2
.        % missing before / operator

Good luck

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Afnan Mussa 2021-4-2

Thank you.

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Answer 3

Jacob Forbes 2021-4-2

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/791179-error-in-equation-variables#answer_665469

Writing a0 into global shouldn't be your issue as you said it is a constant and you have it defined as 1. From what I see, the problem you're running into is you are trying to take the square of a vector (Theta) which cannot be done unless it is done element by element, in which case you would use the operator ".^2" after (Theta) instead of "(Theta)^2" like you currently have written.