Calculate the angle between multiple points
2 次查看(过去 30 天)
显示 更早的评论
I have a matrix A contain x values in the first column and y values in the second column. I want to calculate the angle between vectors.
1 个评论
采纳的回答
Jan
2013-6-13
The ACOS and the corresponding ASIN approchs are numerically instable near to multiples of pi (half). Better use the more accurate ATAN2 method:
angle = atan2(norm(cross(v1,v2)), dot(v1,v2));
4 个评论
Stephen Devlin
2018-3-16
Hi, I have no idea if anyone will see this comment as it is years after the original post, but mathematically what is this expression:
"angle = atan2(abs(det([v1;v2])),dot(v1,v2));"
Jess Smith
2018-12-3
@stephen thats basically doing the inverse tangent of the cross product of 2D vectors over the dot product of those vectors, giving you the angle; cross product of a x b is |a||b|sin(theta) and dot product is |a||b|cos(theta) so dividing them by each other and taking inverse tan is the angle
更多回答(1 个)
另请参阅
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!