Calculate scatter plot point density
jamCalcDensity(x, nbin, bandwidth = NULL, range.x)numeric matrix with two columns representing x,y coordinates.
integer number of bins to subdivide the scatterplot,
expanded to length 2 to accommodate x and y axis bins.
numeric or NULL representing the bandwidth used
for point density determination.
numeric vector length 2 representing the range of
values to consider for point density.
This function is called internally by plotSmoothScatter(),
and is an equivalent replacement for
grDevices:::.smoothScatterCalcDensity().