How to neatly exclude values from a plot?

Question

HC98 2023-11-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2048627-how-to-neatly-exclude-values-from-a-plot

评论： Image Analyst 2023-11-17

I'm plotting 2 functions: eta, feta. What I want to do is plot feta for values between 0, 0.5, 0.7, 0.8, 0.95 and exclude the rest.

I tried somethig like this:

plot(eta(eta<0.5 | eta>0.7), feta(eta<0.5 | eta>0.7), 'k')

but it hasn't worked. Any ideas?

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Answer 1

Image Analyst 2023-11-17

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https://ww2.mathworks.cn/matlabcentral/answers/2048627-how-to-neatly-exclude-values-from-a-plot#answer_1355002

在 MATLAB Online 中打开

"What I want to do is plot feta for values between 0, 0.5, 0.7, 0.8, 0.95 and exclude the rest. "

So that means you want feta between 0 and 0.95 and nowhere else. So do this:

indexes = (feta > 0) & (feta < 0.95);
plot(eta(indexes), feta(indexes), 'k-', 'LineWidth', 2);
grid on;

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Dyuman Joshi 2023-11-17

"Is there a way I can set values outside this range to nan"

Yes, use the indices to assign.

Image Analyst has already shown you how to get the indices, you can utilize that to assign the values.

Image Analyst 2023-11-17

在 MATLAB Online 中打开

What I showed you is how to plot only within the range. If you want to plot the whole range but have NaNs where you don't want to plot, you can do that too:

indexes = (feta > 0) & (feta < 0.95);
eta(indexes) = nan;
feta(indexes) = nan;
plot(eta, feta, 'k-', 'LineWidth', 2);
grid on;

Elements that are nan will not plot a marker (if you're using one) at the nan location, and will not have lines (if you're using them) connecting the nan point to adjacent non-nan points.

Not sure what the x axis limits will be in that case, so you might want to use xlim.

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