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 `xy.coords(x, y)`. `digits` integer specifying the significant digits to be used for determining equality of coordinates. These are compared after rounding them via `signif(*, digits)`.

### Value

A list with three components of same length,

 `x` x coordinates, rounded and sorted. `y` y coordinates, rounded (and sorted within `x`). `number` multiplicities (positive integers); i.e., `number[i]` is the multiplicity of `(x[i], y[i])`.

### See Also

`sunflowerplot` which typically uses `xyTable()`; `signif`.

### Examples

```xyTable(iris[, 3:4], digits = 6)

## Discretized uncorrelated Gaussian:

require(stats)
xy <- data.frame(x = round(sort(rnorm(100))), y = rnorm(100))
xyTable(xy, digits = 1)
```

[Package grDevices version 4.1.0 Index]