histniche {adehabitat}R Documentation

Histograms of the Ecological Niche

Description

histniche draws histograms of the niche-environment system: an histogram of the available resource units (environment) is drawn on the same graph as an histogram of the used resource units (i.e. the niche), for comparison.

Usage

histniche(x, pr, type = c("h", "l"), adjust = 1,
          Acol, Ucol, Aborder, Uborder, Alwd = 1,
          Ulwd = 1, ylim, ncla = 15, ...)

Arguments

x a data frame giving the value of environmental variables (columns) in resource units (rows, e.g. the pixels of a raster map)
pr a vector of integers with the same length as nrow(x) (giving for example the number of detections in the pixels)
type what type of plot should be drawn. Possible types are:
* "h" for histograms,
* "l" for kernel density estimates (see ?density).
By default, type = "h" is used. If type = "l" is used, the position of the mean of each distribution is indicated by dotted lines
adjust if type = "l", a parameter used to control the bandwidth of the density estimate (see ?density)
Acol color for the histograms of the available pixels
Ucol color for the histograms of the used pixels
Aborder if type = "h", color for the border of the histograms of the available pixels (see help(hist.default))
Uborder if type = "h", color for the border of the histograms of the used pixels (see help(hist.default))
Alwd if type = "l", line width for the density estimate of the available pixels
Ulwd if type = "l", line width for the density estimate of the used pixels
ylim the limits for the y axis
ncla The number of classes of the histogram
... further arguments passed to or from other methods

Author(s)

Mathieu Basille basille@biomserv.univ-lyon1.fr

Examples

## Not run: 

data(puechabon)
cp <- count.points(puechabon$locs[,c("X","Y")], puechabon$kasc)
puechabon$kasc
li <- kasc2df(puechabon$kasc)
cpi <- c(cp)[li$index]

histniche(li$tab, cpi)
histniche(li$tab, cpi, ty="l")

## End(Not run)

[Package adehabitat version 1.8.2 Index]