Display a Spatial Interaction Function

Display a spatial interaction function.

plot_inter(fun = "e", span, beta, limit = span * 5)

Arguments

fun

spatial interaction function. Options are "p" (pareto, power law) or "e" (exponential). For pareto the interaction is defined as: (1 + alpha * mDistance) ^ (-beta). For "exponential" the interaction is defined as: exp(- alpha * mDistance ^ beta). The alpha parameter is computed from parameters given by the user (beta and span).

span

distance where the density of probability of the spatial interaction function equals 0.5.

beta

impedance factor for the spatial interaction function.

limit

maximum distance used to retrieved x points, in map units.

Value

a plot

Examples

plot_inter(fun = "e", span = 2000, beta = 2, limit = 4000)

plot_inter(fun = "p", span = 2000, beta = 2, limit = 20000)