getHMedian: Get coordiantes of the median cell after the erode operation
Description
A method for a eroded hexbin object to extract the coordinates of the
median cell. The median is simply the cell with the highest erosion
number or the last cell to be eroded.
# NOT RUN {set.seed(153)
x <- rnorm(10000)
y <- rnorm(10000)
bin <- hexbin(x,y)
smbin <- smooth.hexbin(bin)
erodebin <- erode.hexbin(smbin, cdfcut=.5)
getHMedian(erodebin)
# }