How to Ignore NaN values when plotting?

Question

Saúl Francisco González González 2019-7-27

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https://ww2.mathworks.cn/matlabcentral/answers/473711-how-to-ignore-nan-values-when-plotting

回答： Juan Carlos Ortega 2023-6-14

Hi, If anyone can tell me how to ignore NaN values when you are plotting? Thanks

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Rik 2019-7-27

What do you mean? Most plotting functions will already ignore NaN values by default.

dpb 2019-7-27

在 MATLAB Online 中打开

+1

Altho there are two ways to consider what the Q? might mean and how the plot might look...consider the following:

y=[1:3 nan 4:7];                 % data array w/ an included NaN
subplot(2,1,1)
plot(y,'*-')
legend('NaN silently ignored','Location','northwest')
subplot(2,1,2)
plot(y(isfinite(y)),'*-')
legend('NaN removed from dataset','Location','northwest')

which produces:

So, "how" depends upon what effect one is after -- the straightforward way plot() just leaves holes where NaN elements reside--if one doesn't include them by exclusion programmatically, then the resulting plot makes look like they don't exist at all..which may or may not be kosher in displaying the data.

"It all depends!" :)

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