neighbours | R Documentation |
Return the neighbouring pixels to a given pixel p that is specified at resolution j, in the nested order.
neighbours(p, j)
p |
Pixel index p at resolution j. |
j |
The resolution parameter with nside = 2^j. |
## Return the neighbouring pixels for base pixel 1 neighbours(1, 0) ## Plot the neighbouring pixels for base pixel 1 demoNeighbours <- function(p,j) { neighbours(p, j) displayPixels(boundary.j = j, j = j, plot.j = j+3, spix = neighbours(p, j), boundary.col = "gray", boundary.lwd = 1, incl.labels = neighbours(p, j), col = "blue", size = 3) rcosmo::displayPixelBoundaries(nside = 1, col = "blue", lwd = 3) } demoNeighbours(1,2) demoNeighbours(1,0)
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