Fill light gray color between two horizontal lines in a plot?

Question

Abhik Saha 2023-2-7

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评论： Star Strider 2024-2-14

I want to fill light gray color between two horizontal lines such that I can plot the horizontal lines as dashed dotted ? Please help me regarding this issue. I am writing below the code

x=[1:10];

y=[1:10];

figure(1);clf;

plot(x,y,'b')

hold on

plot([1,10],2*[1,1],'--.k')

hold on

plot([1,10],4*[1,1],'--.k')

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Levente Gellért 2024-2-14

Dear Community members! How can one solve the same problem in 2017a?

Thanks

lg

Star Strider 2024-2-14

My code should work equally well in R2017a.

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Answer 1

Star Strider 2023-2-7

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To plot a ‘dash-dot¹ line requires a slightly different LineStyle definition —

x=[1:10];

y=[1:10];

figure(1)

plot(x,y,'b')

hold on

patch([x, flip(x)], [ones(size(x))*2, ones(size(x))*4], [1 1 1]*0.05, 'Edgecolor','none', 'FaceAlpha',0.25)

plot([1,10],2*[1,1],'-.k')

plot([1,10],4*[1,1],'-.k')

hold off

Plotting the patch as dash-dotted is difficult, however it is possible.

.

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Star Strider 2023-2-9

As always, my pleasure!

Afiq Azaibi 2023-3-17

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In addition to Star Strider's solution, starting in R2023a you can use the xregion and yregion functions:

plot(1:10);

yregion(2, 5, 'EdgeColor', 'black');

You can update the LineStyle, FaceAlpha, and other visuals about the object. However, the default EdgeColor is 'none'.

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Answer 2

Arif Hoq 2023-2-7

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x=[1:10];

y=[1:10];

figure(1);clf;

plot(x,y,'b')

hold on

plot([1,10],2*[1,1],'--.k')

hold on

plot([1,10],4*[1,1],'--.k')

x = [1 10 10 1];

y = [2 2 4 4];

patch(x,y,[.5 .5 .5])

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Benjamin Kraus 2023-2-7

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Using patch as @Arif Hoq suggested is best, but you may also want to set the FaceAlpha and EdgeColor like this:

x=[1:10];

y=[1:10];

figure(1);clf;

plot(x,y,'b')

hold on

plot([1,10],2*[1,1],'--.k')

hold on

plot([1,10],4*[1,1],'--.k')

x = [1 10 10 1];

y = [2 2 4 4];

patch(x,y,'k','FaceAlpha',0.5,'EdgeColor','none')

xlim([1 10])

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Answer 3

Sarvesh Kale 2023-2-7

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Hi ,

You can add the following extra line to your code

rectangle("Position",[1 2 10 2],"FaceColor",[150/255 150/255 150/255],"LineStyle","none");

This will shade the required portion with gray color, However I was not able to toggle its visibility so that the underlying slanted straight line is also visible.