Calculates a geographic distance matrix based on a PresenceAbsence or
a two column matrix of x(longitude) and y(latitude).
Usage
lets.distmat(xy, asdist = TRUE, ...)
Arguments
xy
A PresenceAbsence object or a matrix with two columns (longitude, latitude).
asdist
Logical, if TRUE the result will be an object of class dist,
if FALSE the result will be an object of class matrix.
...
Arguments to be passed to the function rdist.earth of package fields.
Details
This function basically facilitates the use of rdist.earth
on a PresenceAbsence object, allowing also the user to have directly
a dist object.
Value
The user can choose between dist and matrix class object to be returned.
The resulting values are in kilometers (but see the argument 'miles' in rdist.earth).
Author(s)
Bruno Vilela & Fabricio Villalobos
Examples
## Not run:
data(PAM)
distPAM <- lets.distmat(PAM)
## End(Not run)
providing 
.