matrix_get_neighbors {starsExtra} | R Documentation |
Get neighboring cell values for given matrix cell
Description
Get the values of a k
*k
neighborhood, as vector and by row, given a matrix
, k
, and focal cell position (row and column).
Usage
matrix_get_neighbors(m, pos, k = 3)
Arguments
m |
A |
pos |
The focal cell position, a |
k |
Neighborhood size around the focal cell. For example, |
Value
A vector with cell values, ordered by rows, starting from the top left corner of the neighborhood and to the right. When neighborhood extends beyond matrix bounds, only the "existing" values are returned.
Examples
m = matrix(1:12, nrow = 3, ncol = 4)
m
matrix_get_neighbors(m, pos = c(2, 2), k = 3)
matrix_get_neighbors(m, pos = c(2, 2), k = 5)
matrix_get_neighbors(m, pos = c(2, 2), k = 7) # Same result
[Package starsExtra version 0.2.8 Index]