error using plot: Data must be numeric, datetime, duration or an array convertible to double.

Question

Teegan Burks 2020-2-13

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https://ww2.mathworks.cn/matlabcentral/answers/505352-error-using-plot-data-must-be-numeric-datetime-duration-or-an-array-convertible-to-double

评论： the cyclist 2020-2-13

matlab error 2.png

在 MATLAB Online 中打开

I keep getting the error :

Error using plot

Data must be numeric, datetime, duration or an array convertible to double.

Error in acchirp482assign2 (line 38)

plot(t,ac);

But I have no idea what is wrong with the code: please help this assignment was due yesterday :(

.

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Teegan Burks 2020-2-13

I attached the file now

the cyclist 2020-2-13

Walter has given you the correct answer.

But, for future reference, that file you uploaded is still just a picture of your code, which is pretty useless. It's much better to upload the code (for example in an *.m file) or paste the actual text here. That way, if we can grab the code for testing, without having to type it all in ourselves.

Walter was able to notice your mistake just by looking at the code, but often that is not possible, and we need to run your code.

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Answer 1

Walter Roberson 2020-2-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/505352-error-using-plot-data-must-be-numeric-datetime-duration-or-an-array-convertible-to-double#answer_415454

You are not assigning to ac in the posted code.

Your t is a vector. Your if is testing a vector. A vector if test is only true if all elements of it are nonzero (true). Your vector if is not all true and your vector else if is not all true, so you do not assign to ac.

You should look at logical indexing.