set.stripe: Stripes of Different Animal Population Density

In dill/wisp: Wildlife Simulation Package (wisp)

Description

Defines a stripe of a given density inside the population density object.

Usage

        set.stripe(dens, x1, y1, x2, y2, value = 0, width = 1)

Arguments

dens	object of class 'density.population´.
x1	starting x-coordinate of stripe.
y1	starting y-coordinate of stripe.
x2	ending x-coordinate of stripe.
y2	ending y-coordinate of stripe.
value	density value inside stripe area.
width	width of stripe.

Details

The x- and y-coordinates can lie outside the specified region. However, the stripe must cross this region. Since a region is divided into rectangular cells by the density matrix it can occur that the stripe covers some cells only partially (e.g. a stripe that runs diagonally through the region). In this case, a cell will be included if its centre lies inside the stripe area, otherwise not.

Value

set.stripe returns an object of class 'density.population´ which has the following elements:

n.interval.x	number of x-intervals.
n.interval.y	number of y-intervals.
matrix	the (modified) density matrix.

See Also

generate.region to create region objects generate.density to create density objects add.hotspot to include spots of different densities

Examples

# set zero stripe
reg<-generate.region(x.length = 50, y.width = 80)
dens <- generate.density(reg, nint.x = 50, nint.y = 40, southwest = 1, southeast = 10, northwest = 20)
dens <- set.stripe(dens, x1 = 30, y1 = -10, x2 = 10, y2 = 90, width = 4)
plot(dens, method="image")

# set rectangle with constant density
reg<-generate.region(x.length = 50, y.width = 80)
dens <- generate.density(reg, nint.x = 50, nint.y = 40, southwest = 1, southeast = 10, northwest = 20)
dens <- set.stripe(dens, x1 = 33, y1 = 40, x2 = 38, y2 = 10, value = 20, width = 12)
plot(dens)

dill/wisp documentation built on May 15, 2019, 8:31 a.m.