hexDensity (version 1.4.8)

xy2hcell: Find the hexagon cells from xy coordinates given a hexbin object.

Description

Find the hexagon cells IDs from xy coordinates given a hexbin object. Useful if you want to get the KDE value at a certain coordinate.

Usage

xy2hcell(
  hexbin = NULL,
  x,
  y = NULL,
  xbins = NULL,
  xbnds = NULL,
  ybnds = NULL,
  shape = NULL
)

Value

a vector the same length as x with the hexagonal cell ID for each point

Arguments

hexbin

hexbin object to be referenced to.

x, y

coordinates or vectors of coordinates of the points.

xbins

number of bins partitioning the range of xbnds

xbnds, ybnds

horizontal and vertical limit of the binning region. Must be numeric vector of length 2.

shape

shape = yheight/xwidth of the plotting regions.

Details

If a hexbin object is not provided, parameters of the binning region (xbins, xbnds, ybnds, shape) can be used instead. For finding the xy coordinates of the hexagons for a hexbin object, see hcell2xy.

Examples

library(hexbin)
set.seed(133)
d=hexDensity(x=rnorm(20000),y=rnorm(20000),xbins=50)
#Get KDE value at the coordinate x=0,y=0
loc = xy2hcell(d,x=0,y=0)
d@count[loc]