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Radial searches of cartesian points?

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Hi,

I have a data set of several hundred thousand points. Each point is saved as a three dimensional coordinate, i.e. (x, y, z). What I'd like to do is given a point in that space, get a list of all of the points in the table within some radius.

I'm familiar with the q3c package that does this for points that lie on a sphere, but is there something comparable for radial searches on 3D cartesian points? Speed is definitely an issue given the number of points I have.

Thanks for any suggestions!

Cheers,
Demitri


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