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Fill area between plot and the 0-line?
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Hi,
I want to plot some data to show a difference to a reference value and i want that the curve above zero gets filled red and the area of the plot below zero gets filled with blue.
How do i do that?
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채택된 답변
Akira Agata
2020년 6월 1일
The following is an example:
% Sample data
x = linspace(0,4*pi,1000);
y = sin(x);
% Extract positive and negative part
yp = (y + abs(y))/2;
yn = (y - abs(y))/2;
% Plot the data using area function
figure
area(x,yp,'FaceColor','r')
hold on
area(x,yn,'FaceColor','b')
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/307403/image.png)
추가 답변 (2개)
the cyclist
2020년 5월 31일
댓글 수: 3
the cyclist
2020년 5월 31일
The way I would do it is to use your data points to define polygons that are above zero, and polygons that are below zero, and then use patch or fill, to fill them in.
Image Analyst
2020년 6월 1일
For a more general situation, see the FAQ: https://matlab.fandom.com/wiki/FAQ#How_do_I_shade_the_region_between_two_curves.3F
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