Charts drawing problem using semilogy

2022 3 1
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更新时间：2022 3 2
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Why, when I use semilogy, in some cases the graph is not displayed continuously? Is there a solution to this problem? Please pay attention to the image below.

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William Rose
William Rose 2022-3-1
@Mohammad Abedzadeh, please provide the code you used to generate the image. Then people may be able to assist you. Thank you.
Walter Roberson
Walter Roberson 2022-3-1
negative numbers are not drawn for log plots; complex numbers are also not drawn.
Exception: if all of the data in the log dimension is negative, then MATLAB goes ahead and draws it anyhow as-if it had been positive. This is not a design choice I agree with, but it happens.
@Walter Roberson What is your solution? What command should I use for my chart?
Walter Roberson
Walter Roberson 2022-3-1
Save your data and attach it as a .mat so that we can experiment.
@Walter Roberson I can not. Because my code execution time is very long.
Walter Roberson
Walter Roberson 2022-3-1
If you have an existing .fig with the data then you could zip that and attach the zip; we can extract the data from the .fig
Another case where MATLAB does not draw lines, is if the data becames NaN or infinite.

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