layout_focus_group: radial focus group layout

Description

arrange nodes in concentric circles around a focal node according to their distance from the focus and keep predefined groups in the same angle range.

Usage

layout_with_focus_group(
  g,
  v,
  group,
  shrink = 10,
  weights = NA,
  iter = 500,
  tol = 1e-04
)
layout_igraph_focus_group(
  g,
  v,
  group,
  shrink = 10,
  weights = NA,
  iter = 500,
  tol = 1e-04,
  circular
)

Value

matrix of xy coordinates

Arguments

g: igraph object
v: id of focal node to be placed in the center
group: vector indicating grouping of nodes
shrink: shrink the reserved angle range for a group to increase the gaps between groups
weights: possibly a numeric vector with edge weights. If this is NULL and the graph has a weight edge attribute, then the attribute is used. If this is NA then no weights are used (even if the graph has a weight attribute). By default, weights are ignored. See details for more.
iter: number of iterations during stress optimization
tol: stopping criterion for stress optimization
circular: not used

Details

Be careful when using weights. In most cases, the inverse of the edge weights should be used to ensure that the endpoints of an edges with higher weights are closer together (weights=1/E(g)$weight).

Examples

Run this code

library(igraph)
g <- sample_islands(4, 5, 0.8, 2)
grp <- as.character(rep(1:4, each = 5))
layout_with_focus_group(g, v = 1, group = grp, shrink = 10)