Problem with patch function

Question

Oliver Billson 2021-6-22

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/862845-problem-with-patch-function

评论： Oliver Billson 2021-6-23

Hi,

I seem to be running into a common issue with the patch function but cant work out where i'm going wrong.

I want to simply fill the area between two lines, in this case, beach profiles. I've done this succesfully for my other beaches but seem to have issues with the one I've shared. Data and faulty figure attached.

Thanks in advance!

I'd like to fill the area within the polygon magenta and then plot the mean line over the top.

Oli

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Answer 1

Star Strider 2021-6-23

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/862845-problem-with-patch-function#answer_731050

在 MATLAB Online 中打开

I am not certain what you want.

Try this —

DL = load('XZ.mat');
X = DL.X;
Z = DL.Z;
figure
plot(X(1,:), Z(1,:))
hold on
plot(X(2,:), Z(2,:))
patch([X(1,:) fliplr(X(2,:))], [Z(1,:) fliplr(Z(2,:))], 'b', 'FaceAlpha',0.5)
hold off

producing:

I took a wild guess that ‘X(1,:)’ and ‘Z(1,:)’ went together, and ‘X(2,:)’ and ‘Z(2,:)’ did as well. Then the patch call that flips the second vector in each argument (that usually appears to work) created this plot. I only saw two vectors, so no third vector for the ‘mean profile’. I have no idea if that’s supposed to be supplied or is to be calculated (or how to calculate it) from the existing vectors.

.