| xyTable {grDevices} | R Documentation |
Multiplicities of (x,y) Points, e.g., for a Sunflower Plot
Description
Given (x,y) points, determine their multiplicity – checking for equality only up to some (crude kind of) noise. Note that this is special kind of 2D binning.
Usage
xyTable(x, y = NULL, digits)
Arguments
x, y |
numeric vectors of the same length; alternatively other
(x, y) argument combinations as allowed by
|
digits |
integer specifying the significant digits to be used for
determining equality of coordinates. These are compared after
rounding them via |
Value
A list with three components of same length,
x |
x coordinates, rounded and sorted. |
y |
y coordinates, rounded (and sorted within |
number |
multiplicities (positive integers); i.e.,
|
Note
Missing values in the coordinates are counted towards the multiplicities. The sum of the multiplicities will equal the number of coordinates.
See Also
sunflowerplot which typically uses
xyTable(); signif.
Examples
xyTable(iris[, 3:4], digits = 6)
## If missing coordinates exist, they are also counted
iris2 <- iris[1:10, 3:4]
iris2[4, 2] <- NA
iris2[c(3, 5), ] <- NA
xyTable(iris2)
## Discretized uncorrelated Gaussian:
xy <- data.frame(x = round(sort(stats::rnorm(100))), y = stats::rnorm(100))
xyTable(xy, digits = 1)