origin.density: Create a table of densities about the origin

In pwhigham/spatibm: A Spatial Individual-based model for land-based organisms

Description

For a given window, randomly place 1:num.pts in a window and measure the density at (0,0) using the bandwidth sigma. This can be used to understand the density for randomly distributed populations when setting the crowding parameters for the model.

Usage

origin.density(win, num.pts = 20, trials = 10, sigma = 1)

Arguments

win	Spatial window of type owin
num.pts	Maximum number of points to randomly place in the window
trials	Number of times to resample points
sigma	The bandwidth used for density.ppp

Value

Matrix with number of rows as points increase from 1:num.pts, each column is the measured density at (0,0) for the particular number of points for each trial.

Examples

# Create a window centred on (0,0)
win <- owin(xrange=c(-2,2),yrange=c(-2,2),unitname="metres")
den <- origin.density(win,num.pts=20,trials=50)
boxplot(t(den),xlab="Number Points",ylab="Density")

pwhigham/spatibm documentation built on Aug. 30, 2019, 1:16 p.m.