How to color some region of plot?

Question

Enrica Brunetti 2019-8-25

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/477516-how-to-color-some-region-of-plot

编辑： Afiq Azaibi 2023-3-17

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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Answer 1

Image Analyst 2019-8-25

3
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/477516-how-to-color-some-region-of-plot#answer_388974

编辑：Image Analyst 2019-8-25

在 MATLAB Online 中打开

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;