add.hotspot: Spots of Different Animal Population Density
In dill/wisp: Wildlife Simulation Package (wisp)

Description Usage Arguments Details Value See Also Examples

Adds a spot of higher or lower density to a population density object.

1	add.hotspot(dens, x, y, altitude, sigma)

`dens`	object of class 'density.population´
`x`	x-coordinate of hotspot centre
`y`	y-coordinate of hotspot centre
`altitude`	height of hotspot
`sigma`	width of hotspot

The function adds a specified two-dimensional Gaussian distribution to the given density object. The centre of the hotspot must be given in region coordinates. The height can be negative. The width is defined by sigma, the standard deviation of the Gaussian distribution.

add.hotspot 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.

generate.region to create region objects generate.density to create density objects set.stripe to include stripes of different densities

myreg <- generate.region(x.length =100, y.width = 50)
mydens <- generate.density(myreg,nint.x = 100, nint.y = 50, southwest = 1, southeast = 10, northwest = 20)

mydens<-add.hotspot(mydens, 20,10, 100,10)
plot(mydens)
plot(mydens, method="image")