Array of index, should return indexed values on the same array format

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PsykotropyK
PsykotropyK 2020-2-12
回答： Sindar 2020-2-12
Hello,
I used knnsearch to find the 100 nearest points from a set of points. I end up having a matrix m=Nx100 that lists all the indexes of the 100 closest to a point. For instance I have (matrix shortened to 4x6):
m=[1 215 106405 210 37814 21780 ; 2 197 13769 21537 40151 40168 ; 3 200 212 503 3375 3943 ; 4 241 250 262 266 271]
Here it means that
The 1st point's 6 closest points are indexes 1, 215, 106405, 210, 37814, 21780
The 2nd point's 6 closest points are indexes 2, 197, 13769, 21537, 40151, 40168
I then have a vector v which represents a weight associated to each points. Hence I would like to have a matrix, Nx100, where each value would be the v(i), something like :
[v(1) v(215) v(106405) v(210) v(37814) v(21780) ; v(2) v(197) v(13769)....................]
I am sure there is a simple way to do it, but I couldn't find the answer.

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回答（1 个）

Sindar
Sindar 2020-2-12
It sounds like
weights = v(m);
should work

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