3D nearest neighbour vector

[Steve]

Hi all,

I  was wondering whether anyone has a pluggin or knows of the best technique to work out the nearest neighbour vector in 3D space. The data is essentially paricles distributed in space and I want to determine whether there is anisotropy of the particles and be able to quantify it.

Regards,
Steve

[Marcel]

Hello,

i would recommend you to use "R" (after your ImageJ measurements)
 
http://www.r-project.org/

with the "spatstat" package
 
http://www.spatstat.org/spatstat/

which can calculate nearest neighbour distances in 3d, Ripley`s K function in 3d etc.
You can calculate it in Java (by yourself) but i think the spatstat package has many useful methods
already available for your analysis.