getneighborhood_fast | R Documentation |
an efficient function to find the neighborhood based on the matrix of position and a pre-defined cutoff
getneighborhood_fast(x, radius)
x |
is a n-by-2 matrix of position. |
radius |
is a threashold of Euclidean distance to decide whether a spot is an neighborhood of another spot. For example, if the Euclidean distance between spot A and B is less than cutoff, then A is taken as the neighbourhood of B. |
A sparse matrix containing the neighbourhood
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