Polyshape: stop Connecting first and last points.
5 ビュー (過去 30 日間)
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Hello all, How you doin? Can you please help me with an issue?
Problem:
I have many sets of Data (Like attached one), in two vectors that are produced seperetly by another script.
Now, I need to plot them, devide them between "Closed" and "Open" , Then search between "Closed" ones to see which one is the stable one.
I used "polyshape" like it:
load('Data');
a = polyshape(Data(:,1),Data(:,2),'Simplify',true);
b =regions(a);
plot(b)
the problem is that polyshape connects first and last point automaticlly (even when simplify is off). So all regions are closed now and finding stable region encounter with wrong answers.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/247922/image.jpeg)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/247923/image.jpeg)
Do you have any idea, about disabling this feature (to leave the plot as it is), Or any alternative command that works like "polyshape" and has ability to recognize regions with their boundry points?
Thanks a lot for your time.
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Another Example:
how to find boundries of JUST closed area of this points? (Data2.m)
![ee.JPG](https://www.mathworks.com/matlabcentral/answers/uploaded_files/247938/ee.jpeg)
5 件のコメント
Adam Danz
2019 年 11 月 13 日
@ Armin Mashhadi, if you'd like to share your solution, please add it as an answer. "got it" isn't an answer.
回答 (1 件)
Stijn Haenen
2019 年 11 月 12 日
Hi,
do you mean this?
load('Data');
a=polyshape(Data(:,1),Data(:,2));
b=regions(a);
area=[b(2,1).Vertices(:,1) b(2,1).Vertices(:,2)];
line=[b(3,1).Vertices(:,1) b(3,1).Vertices(:,2);b(1,1).Vertices(:,1) b(1,1).Vertices(:,2)];
shape_area=polyshape(area);
plot(regions(shape_area));
hold on
[c,d]=max(line(1:end-1,1)-line(2:end,1));
plot(line(d+1:end,1),line(d+1:end,2),'black');
plot(line(1:d-1,1),line(1:d-1,2),'black');
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