Fill area between plot and the 0-line?

Question

Julozert 2020-5-31

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https://ww2.mathworks.cn/matlabcentral/answers/539271-fill-area-between-plot-and-the-0-line

评论： Harshit 2022-10-31

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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Answer 1

Akira Agata 2020-6-1

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https://ww2.mathworks.cn/matlabcentral/answers/539271-fill-area-between-plot-and-the-0-line#answer_443971

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')

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Julozert 2020-6-1

thank you very much

Harshit 2022-10-31

ni chal ra

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Answer 2

the cyclist 2020-5-31

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You can use either the fill or patch command. See the examples there for guidance.

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the cyclist 2020-5-31

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 2020-5-31