Nothing
##########################################
## ---- BUILD Five Point Laplacian ---- ##
##########################################
build.lap <- function(xdim,ydim) {
lap <- matrix(0, xdim, ydim)
lap.mid.x <- ceiling(nrow(lap)/2)
lap.mid.y <- ceiling(ncol(lap)/2)
lap[(lap.mid.x - 1):(lap.mid.x + 1), (lap.mid.y - 1):(lap.mid.y + 1)] = c(0, 1, 0, 1, -4, 1, 0, 1, 0)
return(lap)
}
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