find the index of Curve intersections

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Yang Lu
Yang Lu 2019-1-9
回答： Yang Lu 2019-2-6
Hi all,
I am programing to find the indexes of the intersections of two lines. I use the code Curve intersection by NS to find the intersection value but am not able to find the indexes of the intersection value using the 'k = find(y==constant)'. I think the reason is that the intersections are not in the two lines, so it returens back to null.
Thank you in advance.
kind regards.

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回答（2 个）

KSSV
KSSV 2019-1-10
Use knnsearch. This will give you the exact point if exists...or the nearest point to the intersection.....
Yang Lu
Yang Lu 2019-2-6
Hi,
I use InterX reference from https://uk.mathworks.com/matlabcentral/fileexchange/11837-fast-and-robust-curve-intersections to find the intersection coordinates first and then use 'find' command to search the shortest arc-length which is corresponding to the index of the intersection coordiantes.
Thank you.

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