Top "Nearest-neighbor" questions

Nearest neighbors are points (or other objects) in close proximity to a given location in some multi-dimensional space, e.g. a plane.

Efficient implementation of the Nearest Neighbour Search

I am trying to implement an efficient algorithm for nearest-neighbour search problem. I have read tutorials about some data structures, …

c++ tree nearest-neighbor
How does the KD-tree nearest neighbor search work?

I am looking at the Wikipedia page for KD trees. As an example, I implemented, in python, the algorithm for …

python machine-learning nearest-neighbor kdtree
HTML5 Canvas Image Scaling Issue

I am trying to make a pixel art themed game in HTML5 canvas, and as part of that I take 10…

html html5-canvas nearest-neighbor bicubic
Find closest point in matlab grid

G'day I'm trying to program a smart way to find the closest grid points to the points along a contour. …

matlab nearest-neighbor
Finding near neighbors

I need to find "near" neighbors among a set of points. There are 10 points in the above image. Red lines …

matlab computational-geometry nearest-neighbor delaunay voronoi
How to find neighbors of a 2D list in python?

I have a 2D list of only 1's and 0's: Boundaries = [ [0,0,0,0,0], [0,1,1,1,0], [0,1,1,1,1], [0,1,1,1,0], [0,0,1,0,0]] I need to test this list to check if …

python arrays list nearest-neighbor
Efficient method for finding KNN of all nodes in a KD-Tree

I'm currently attempting to find K Nearest Neighbor of all nodes of a balanced KD-Tree (with K=2). My implementation is …

algorithm nearest-neighbor kdtree knn
kNN with big sparse matrices in Python

I have two large sparse matrices: In [3]: trainX Out[3]: <6034195x755258 sparse matrix of type '<type 'numpy.float64…

python scikit-learn sparse-matrix nearest-neighbor
Why does decreasing K in K-nearest-neighbours increase complexity?

In an extract from my textbook it says that reducing the value of K when running this algorithm actually increases …

algorithm artificial-intelligence complexity-theory nearest-neighbor
K-d trees: nearest neighbor search algorithm

This is my understanding of it: 1. Recurse down the tree, taking the left or right subtree according as whether ELEMENT …

algorithm nearest-neighbor kdtree