x-y plot: how to shade the difference between two lines in multiple colors

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MS 2020-7-23

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https://ww2.mathworks.cn/matlabcentral/answers/569761-x-y-plot-how-to-shade-the-difference-between-two-lines-in-multiple-colors

评论： Star Strider 2020-7-24

采纳的回答： Star Strider

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kindly help me to fill the diffrence with two diffrent colur in a x y plot as shown in the below example figure?

I need to shade postive(red color) and negative diffrences(blue color) in diffrent colors. Kindly give your suggesttions

t= 0:.01:1
AA = cos(t)
BB= sin(t)
diff = AA-BB
plot(t,AA)
hold on
plot(t,BB)
patch([t fliplr(t)], [AA fliplr(BB)], 'r')
hold off
%%% any suggestions Please!!

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采纳的回答

Star Strider 2020-7-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/569761-x-y-plot-how-to-shade-the-difference-between-two-lines-in-multiple-colors#answer_470149

在 MATLAB Online 中打开

Correct idea, not quite the correct approach.

Try this:

t= 0:.01:1;
AA = cos(t);
BB= sin(t);
Lv = AA > BB;                                                       % Logical Vector
figure
plot(t,AA)
hold on
plot(t,BB)
patch([t(Lv) fliplr(t(Lv))], [AA(Lv) fliplr(BB(Lv))], 'r')
patch([t(~Lv) fliplr(t(~Lv))], [AA(~Lv) fliplr(BB(~Lv))], 'g')
hold off

producing:

.This uses ‘logical indexing’ to separate the two regions.

The independent variable (‘t’ here) may need greater resolution for more complicated curves for this approach to work correctly. If the curves are data, use linspace to create the indpendent variable vector with greater resolution, and interp1 to interpolate the data to it.