Image {IDPmisc} | R Documentation |
The density of points in a scatter plot is encoded by color.
Image(x, y, pixs = 1, zmax = NULL, colramp = IDPcolorRamp)
x, y |
Coordinates of points whose density should be plotted. |
pixs |
Size of pixel in mm on the plotting device. |
zmax |
Maximum counts per Pixel to be plotted. When NULL the density
in the scatter plot is encoded from 0/pixel to maximum/pixel
found. zmax must be equal or larger than maximum counts found. |
colramp |
Color ramp to encode the density of the points within a pixel. |
Before calling Image
a plot must have been created by, for
example, calling plot(x,y,type="n")
. A similar solution for
plotting densities is realized in the package fields:
image.count
. The main differences between the
solution in IDPmisc and fields are the following: In
Image
the pixel size is defined in mm on the plotting device
whereas in image.count
the number of pixels in
x- and y-direction are defined. Image
works on ordinary plots
whereas image.count
needs the special plotting
function image.plot
.
Maximum number of counts per Pixel found.
Andreas Ruckstuhl, refined by Rene Locher
ipairs
, ilagplot
,
ixyplot
, image
,
image.count
x <- rnorm(10000) y <- rnorm(10000,10) plot(x+y,y,type="n") Image(x+y,y)