MATLAB Answers

Fill area between plot and the 0-line?

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Julozert
Julozert on 31 May 2020
Answered: Image Analyst on 1 Jun 2020
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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Accepted Answer

Akira Agata
Akira Agata on 1 Jun 2020
How about using area function?
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')

More Answers (2)

the cyclist
the cyclist on 31 May 2020
You can use either the fill or patch command. See the examples there for guidance.

  3 Comments

Julozert
Julozert on 31 May 2020
How do i use fill so that my positive data gets red and my negative data gets blue?
the cyclist
the cyclist on 31 May 2020
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.
Julozert
Julozert on 31 May 2020
How can i use my data points to define polygons?

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