group_assign: Assign individuals to groups based on 2-dimensional location...
In vjf2/SocGen: Analysis of Genetic and Social Behavior Data

This function clusters individuals into groups based on their locations and some mean group size.

group_assign(
  data = data,
  id = "id",
  xcoord = "x",
  ycoord = "y",
  time = NULL,
  group_size = NULL,
  group_vector = NULL,
  method = c("hclust", "kmeans")
)

`data`	list of simulation data generated by swap or UD method
`id`	individual identifier field
`time`	time step variable
`group_size`	average group size in results
`group_vector`	vector of group sizes per time step
`method`	grouping method, either kmeans or hierarchical clustering
`xcoords`	x coordinates
`ycoords`	y coordinates