Unexpected output form intersect (polyxpoly)
2 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
I am getting an unexpected output when I try to apply intersect to the following two polygons:
A = [2 6 4 2 -1 0;
0 -1 2 4 6 2];
B = [0 6 6 0;
0 0 6 6];
C = intersect(A, B)
Namely, C contains the point [-1; 6], which it should not contain. What baffles me is that [6; -1] is correctly excluded, even though the two shapes are symmetric about the positive diagonal. The same mistake happens if I initialize A and B using the polyshape command:
A = polyshape([2 6 4 2 -1 0], [0 -1 2 4 6 2]);
B = polyshape([0 6 6 0], [0 0 6 6]);
Does anybody have an idea what is wrong?
0 comentarios
Respuestas (1)
Turlough Hughes
el 26 de En. de 2020
When you're using intersect to do what you have described you need to ensure you have inputs of either two polyshapes, a polyvec, or a polyshape and a linsegment as described here. Your input was two arrays and so you ended up doing a set intersection which has it's own seperate documention.
Try the following:
A = polyshape([2 6 4 2 -1 0], [0 -1 2 4 6 2]);
B = polyshape([0 6 6 0], [0 0 6 6]);
C = intersect(A,B);
figure(), plot(A)
hold on, plot(B)
plot(C,'FaceAlpha',0,'LineWidth',3,'EdgeColor','red')
2 comentarios
Ver también
Categorías
Más información sobre Elementary Polygons en Help Center y File Exchange.
Productos
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!