Function to calculate any neighbors for each hexagon/rectangle in a grid
sNeighAny is supposed to calculate any neighbors for each
hexagon/rectangle in a regular 2D grid. It returns a matrix with rows
for the self, and columns for its any neighbors.
an object of class "sTopol" or "sInit" or "sMap"
aNeigh: a matrix of nHex x nHex, containing distance info in terms of any neighbors, where nHex is the total number of hexagons/rectanges in the grid
The return matrix has rows for the self, and columns for its neighbors. The non-zeros mean the distance away from its neighbors, and the zeros for the self-self. It has rows/columns ordered in the same order as the "coord" matrix of the input object does.
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# 1) generate an iid normal random matrix of 100x10 data <- matrix( rnorm(100*10,mean=0,sd=1), nrow=100, ncol=10) # 2) from this input matrix, determine nHex=5*sqrt(nrow(data))=50, # but it returns nHex=61, via "sHexGrid(nHex=50)", to make sure a supra-hexagonal grid sTopol <- sTopology(data=data, lattice="hexa", shape="suprahex") # 3) initialise the codebook matrix using "uniform" method sI <- sInitial(data=data, sTopol=sTopol, init="uniform") # 4) calculate any neighbors based on different objects # 4a) based on an object of class "sTopol" aNeigh <- sNeighAny(sObj=sTopol) # 4b) based on an object of class "sMap" # aNeigh <- sNeighAny(sObj=sI)
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