R: Frequency distribution of a variable within a species' range
lets.classvar
R Documentation
Frequency distribution of a variable within a species' range
Description
Based on a species Presence-Absence matrix including
variables of interest (see lets.addvar), the
function divides a continuous variable into classes and counts
the frequency of each class within each species' range.
Usage
lets.classvar(x, groups = "default", pos, xy)
Arguments
x
Presence-absence matrix with a single variable
added (see lets.addvar).
groups
The number of classes into which the variable will be divided.
Default calculates the number of classes as the
default for a histogram (hist).
pos
Column number containing the variable of interest.
xy
Logical, if TRUE the input matrix contains the geographic
coordinates in the first two columns.
Value
A matrix with species in the rows and the variable's
classes in the columns.
Author(s)
Bruno Vilela
References
Morales-Castilla et al. 2013. Range size patterns of New
World oscine passerines (Aves): insights from differences among migratory
and sedentary clades. Journal of Biogeography, 40, 2261-2273.