Display a Spatial Interaction Function — plot

Display a spatial interaction function.

Usage

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

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.

a plot

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

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