How to shade several areas in a plot?

Question

Malahat Mehraban 2021-12-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1609590-how-to-shade-several-areas-in-a-plot

评论： Malahat Mehraban 2021-12-13

Hello everyone,

I want to shade some points in a figure. These points are for example 35 in a plot with the length of 600 point. How can I plot these shades in a for loop?

I actually expect to get somthing like the picture that I have attached. I have a figure with three subplots and I want to shade 35 points of these plots.

Thank you in advance for your helps.

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Answer 1

Star Strider 2021-12-13

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https://ww2.mathworks.cn/matlabcentral/answers/1609590-how-to-shade-several-areas-in-a-plot#answer_854005

在 MATLAB Online 中打开

Try this —

x = 210:0.5:227;

y = randn(size(x));

bands = [214 216; 221 223]; % X-Coordinates Of Band Limits: [x(1,1) x(1,2); x(2,1) x(2,2)]

figure

plot(x, y)

hold on

xp = [bands fliplr(bands)]; % X-Coordinate Band Definitions

yp = ([[1;1]*min(ylim); [1;1]*max(ylim)]*ones(1,size(bands,1))).'; % Y-Coordinate Band Definitions

for k = 1:size(bands,1) % Plot Bands

patch(xp(k,:), yp(k,:), [1 1 1]*0.25, 'FaceAlpha',0.5, 'EdgeColor',[1 1 1]*0.25)

end

hold off

This is fully adaptive to the size of the plot limits, requiring only that the ‘bands’ matrix be defined.

I doubt if there is a way to do this without the loop.

.

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Malahat Mehraban 2021-12-13

It was a great solution, Thank you.

Star Strider 2021-12-13

As always, my pleasure!

.

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Answer 2

Chunru 2021-12-13

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https://ww2.mathworks.cn/matlabcentral/answers/1609590-how-to-shade-several-areas-in-a-plot#answer_853765

在 MATLAB Online 中打开

x = 210:.5:218;

y =randn(size(x));

plot(x, y); hold on

yl = ylim;

% Use the patch for the box

patch([212 213 213 212], [yl(1) yl(1) yl(2) yl(2)], [0.3 0.3 0.3], 'FaceAlpha', 0.3 )

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Malahat Mehraban 2021-12-13

Thank you :)

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Answer 3

Voss 2021-12-13

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https://ww2.mathworks.cn/matlabcentral/answers/1609590-how-to-shade-several-areas-in-a-plot#answer_853775

Look into patch or fill, which are different ways to do basically the same thing.

In addition to the x- and y-coordinates of the rectangles you want to add to the plots, you'll need to specify the 'AlphaData' property for the transparency and the 'EdgeColor' property for the red lines around the edges. A list of patch properties is here.