letsR (version 4.0)

lets.distmat: Compute a geographic distance matrix

Description

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.

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).

Details

This function basically facilitates the use of rdist.earth on a PresenceAbsence object, allowing also the user to have directly a dist object.

Examples

# NOT RUN {
data(PAM)
distPAM <- lets.distmat(PAM)   
# }
# NOT RUN {
# }