How to shade with upper and lower limits along a curve line? (see example in image below)

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juan sanchez 2023-4-26

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https://ww2.mathworks.cn/matlabcentral/answers/1953374-how-to-shade-with-upper-and-lower-limits-along-a-curve-line-see-example-in-image-below

评论： juan sanchez 2023-4-26

采纳的回答： albara

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Answer 1

albara 2023-4-26

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https://ww2.mathworks.cn/matlabcentral/answers/1953374-how-to-shade-with-upper-and-lower-limits-along-a-curve-line-see-example-in-image-below#answer_1223649

在 MATLAB Online 中打开

To shade the area between two curves in MATLAB, you can use the fill() function. Here is an example code that demonstrates how to do this:

% Define x and y values for the curves

x = linspace(0, 4*pi, 100);

y1 = sin(x);

y2 = cos(x);

% Define the upper and lower limits

y_upper = y1 + 0.5;

y_lower = y2 - 0.5;

% Plot the curves

plot(x, y1, 'b-', 'LineWidth', 2);

hold on;

plot(x, y2, 'r-', 'LineWidth', 2);

% Fill the area between the curves

fill([x fliplr(x)], [y_upper fliplr(y1)], 'b', 'FaceAlpha', 0.2);

fill([x fliplr(x)], [y_lower fliplr(y2)], 'r', 'FaceAlpha', 0.2);

% Add legend and axis labels

legend('y1', 'y2');

xlabel('x');

ylabel('y');

In this example, the fill() function is used twice to fill the area between the two curves. The fliplr() function is used to create a mirrored set of x values so that the area is filled in properly. The 'FaceAlpha' parameter is used to set the transparency of the filled area.

You can modify the y_upper and y_lower arrays to define your upper and lower limits for your specific application.

is this helps?

Important: There may be some mistakes in this answer Experts can tell if there are any mistakes

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juan sanchez 2023-4-26

Excellent. Thank you very much for explaining.

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Answer 2

chicken vector 2023-4-26

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https://ww2.mathworks.cn/matlabcentral/answers/1953374-how-to-shade-with-upper-and-lower-limits-along-a-curve-line-see-example-in-image-below#answer_1223659

在 MATLAB Online 中打开

N = 100;
x = linspace(0,2*pi,N);
y = 1 + cos(x);
yNoiseUp = y + 0.5 + .25*(sin(x) + .25*(rand(1,N) - 0.5));
yNoiseDown = y - 0.5 - .25*(sin(x) + .25*(rand(1,N) - 0.5));
figure;
grid on;
hold on;
fill([x flip(x)],[yNoiseUp flip(yNoiseDown)],[.8 .8 .8],'FaceAlpha',.7)
plot(x,y,'k','LineWidth',2);
plot(x,yNoiseUp,'k');
plot(x,yNoiseDown,'k');
hold off;
xlim([0,x(end)]);
xlabel('\theta_3 [deg]')
ylabel('C_{p,3}')