directed_geom: Directed geometric graph

In antiphon/Kdirectional: Analysis of anisotropy in point patterns using second order statistics

Directed geometric graph

Description

Compute the geometric graph

x1 ~ x2 <=> ||x1-x2||< r & -theta < angle(x2-x1, u) < theta

Usage

directed_geom(x, u, theta, r, from, to, double = TRUE, pregraph)

Arguments

x	matrix of location coordinates
u	unit vector of direction
theta	angle for the directed cone
r	radius for neighbourhood
from	default 1:nrow(x), indices of points from which to compute edges
to	default 1:nrow(x), indices of points which account as potential neighbours
double	use the double cone, i.e. look also in direction -u?
pregraph	A list-of-neighbour indices where to look for potential neighbours

Details

If pregraph is given, "to" is ignored.

Value

Neighbour index vectors as a list.

antiphon/Kdirectional documentation built on Feb. 13, 2023, 6:26 a.m.