# s.kde2d: Scatter Plot with Kernel Density Estimate In ade4: Analysis of Ecological Data: Exploratory and Euclidean Methods in Environmental Sciences

 s.kde2d R Documentation

## Scatter Plot with Kernel Density Estimate

### Description

performs a scatter of points without labels by a kernel Density Estimation in One or Two Dimensions

### Usage

```s.kde2d(dfxy, xax = 1, yax = 2, pch = 20, cpoint = 1, neig = NULL, cneig = 2,
xlim = NULL, ylim = NULL, grid = TRUE, addaxes = TRUE, cgrid = 1,
include.origin = TRUE, origin = c(0, 0), sub = "", csub = 1.25,
possub = "bottomleft", pixmap = NULL, contour = NULL,
area = NULL, add.plot = FALSE)
```

### Arguments

 `dfxy` a data frame with at least two coordinates `xax` the column number for the x-axis `yax` the column number for the y-axis `pch` if `cpoint` > 0, an integer specifying the symbol or the single character to be used in plotting points `cpoint` a character size for plotting the points, used with `par("cex")*cpoint`. If zero, no points are drawn `neig` a neighbouring graph `cneig` a size for the neighbouring graph lines used with par("lwd")*`cneig` `xlim` the ranges to be encompassed by the x axis, if NULL, they are computed `ylim` the ranges to be encompassed by the y axis, if NULL, they are computed `grid` a logical value indicating whether a grid in the background of the plot should be drawn `addaxes` a logical value indicating whether the axes should be plotted `cgrid` a character size, parameter used with par("cex")* 'cgrid' to indicate the mesh of the grid `include.origin` a logical value indicating whether the point "origin" should be belonged to the graph space `origin` the fixed point in the graph space, for example c(0,0) the origin axes `sub` a string of characters to be inserted as legend `csub` a character size for the legend, used with `par("cex")*csub` `possub` a string of characters indicating the sub-title position ("topleft", "topright", "bottomleft", "bottomright") `pixmap` an object `pixmap` displayed in the map background `contour` a data frame with 4 columns to plot the contour of the map : each row gives a segment (x1,y1,x2,y2) `area` a data frame of class 'area' to plot a set of surface units in contour `add.plot` if TRUE uses the current graphics window

### Value

The matched call.

Daniel Chessel

### Examples

```# To recognize groups of points