makePoints: Creates a set of random points

In gregorp/rlandscape: Generates random landscapes with specifiable spatial characteristics

Description

This is called by rlandscape to generate points. Uses any combination of four methods

• uniform - the x and y coordinates are evenly distributed across the landscape

• lattice - the points are chosen from the lattice points of a grid overlaid on the landscape

• cluster - cluster locations are chosen by the uniform method, then points are added to each cluster following a bivariate Gaussian distribution

• SSI - points are chosen by the uniform method with an imposed inhibition distance so that new points cannot be placed close to existing points

Usage

makePoints(n = c(100, 0, 0, 0), hAsp = 1, control = list())

Arguments

n	a vector of length up to 4 specifying how many points to create by each method: uniform, lattice, cluster, and inhibition (SSI), respectively.
hAsp	a single positive numeric, the horizontal to vertical aspect ratio of the window to create the points in.
control	a list of parameters. The elements include any or all of the following: lattice, a vector of length 2 containing the number of horizontal and vertical grid lines that lattice points are to be chosen from. cluster, a vector of length 2 specifying the number of points per cluster and the cluster spread (standard deviation of a bivariate Gaussian) ssi, a single numeric, the inhibition distance for the SSI method.

Details

Additional control parameters can be passed to the lattice, cluster and SSI point processes via the control parameter.

Value

Returns coordinates of the points produced in a list of two vectors, x and y.

gregorp/rlandscape documentation built on May 17, 2019, 8:36 a.m.