Filling between several curves in a figure using fill or patch functions

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hamed 2020-9-16

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https://ww2.mathworks.cn/matlabcentral/answers/594514-filling-between-several-curves-in-a-figure-using-fill-or-patch-functions

评论： Ameer Hamza 2020-9-22

I have a figure, in which 4 curves are plotted. I want to fill between these curves twp by two with a specific color (red, green, ...) I attached the plots I want to fill. How can I do that?

Thanks

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Ameer Hamza 2020-9-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/594514-filling-between-several-curves-in-a-figure-using-fill-or-patch-functions#answer_495307

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See this example

y = 1:400;
x1 = 0.1*rand(size(y));
x2 = 0.1*rand(size(y))+1;
x3 = 0.1*rand(size(y))+0.4;
x4 = 0.1*rand(size(y))+1.4;
ax = axes();
hold(ax);
plot(x1, y);
plot(x2, y);
Y = [y fliplr(y)];
X = [x1 fliplr(x2)];
p = patch(X, Y, 'r', 'FaceAlpha', 0.2);
Y = [y fliplr(y)];
X = [x3 fliplr(x4)];
p = patch(X, Y, 'g', 'FaceAlpha', 0.2);

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hamed 2020-9-21

编辑：hamed 2020-9-21

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Hi again Ameer,

I plotted a 1D signal in Matlab, and then I want to show the value of each specific sample by a district colour. something like what "imagesc" command does for 2D plots. I attached an example of what is in my mind. Any suggestions, please?

This is what I have written, but the distribution of the values is weird! I expected a linear behaviour of the values at each sample.

p(1, 2).select();
twt = tie_out_mid.well_log.logs.twt(97:end);
y = twt';
CGR = tie_out_mid.well_log.logs.cgr(97:end);
x = CGR';
x0 = zeros(size(x))';
Y1 = [y fliplr(y)];
X1 = [x0 fliplr(x)];
ColorData = vertcat (x', flip(x'));
patch(X1, Y1, ColorData);