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How to color some region of plot?
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Enrica Brunetti
il 25 Ago 2019
Modificato: Afiq Azaibi
il 17 Mar 2023
If I have this plot
y = [70, 72, 60, 66, 60, 57, 59, 58, 60, 73, 72, 73, 73, 72, 52, 72, 77, 59, 49, 66];
x = [1: 20];
what function can I use to color some region of plot, when for example y(i) > 70?
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Image Analyst
il 25 Ago 2019
Modificato: Image Analyst
il 25 Ago 2019
Try this,using patch():
% Plot original data.
y = [70, 72, 60, 66, 60, 57, 59, 58, 60, 73, 72, 73, 73, 72, 52, 72, 77, 59, 49, 66];
x = [1: 20];
plot(x, y, 'b*-');
grid on;
hold on;
% Make patch of transparent color.
yl = ylim
xl = xlim
xBox = [xl(1), xl(1), xl(2), xl(2), xl(1)]
yBox = [70, yl(2), yl(2), 70, 70]
patch(xBox, yBox, 'black', 'FaceColor', 'green', 'FaceAlpha', 0.1);
hold off;
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/235264/image.png)
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Afiq Azaibi
il 17 Mar 2023
Modificato: Afiq Azaibi
il 17 Mar 2023
In addition to Image Analyst's solution, starting in R2023a you can use the xregion and yregion functions.
y = [70, 72, 60, 66, 60, 57, 59, 58, 60, 73, 72, 73, 73, 72, 52, 72, 77, 59, 49, 66];
x = [1: 20];
plot(x, y, 'b*-');
yregion(70,80,"FaceColor", 'g'); % Note, 80 is the end point so if you pan past 80, the region will stop.
yregion(45, 70, "FaceColor", 'r');
You can also set the EdgeColor properties to emphasize the edges but the default EdgeColor is 'none'.
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