layout_centrality: radial centrality layout

In graphlayouts: Additional Layout Algorithms for Network Visualizations

radial centrality layout

Description

arranges nodes in concentric circles according to a centrality index.

Usage

layout_with_centrality(
  g,
  cent,
  scale = TRUE,
  iter = 500,
  tol = 1e-04,
  tseq = seq(0, 1, 0.2)
)

layout_igraph_centrality(
  g,
  cent,
  scale = TRUE,
  iter = 500,
  tol = 1e-04,
  tseq = seq(0, 1, 0.2),
  circular
)

Arguments

g	igraph object
cent	centrality scores
scale	logical. should centrality scores be scaled to [0,100]? (Default: TRUE)
iter	number of iterations during stress optimization
tol	stopping criterion for stress optimization
tseq	numeric vector. increasing sequence of coefficients to combine regular stress and constraint stress. See details.
circular	not used

Details

The function optimizes a convex combination of regular stress and a constrained stress function which forces nodes to be arranged on concentric circles. The vector tseq is the sequence of parameters used for the convex combination. In iteration i of the algorithm tseq[i] is used to combine regular and constraint stress as (1-tseq[i])*stress_{regular}+tseq[i]*stress_{constraint}. The sequence must be increasing, start at zero and end at one. The default setting should be a good choice for most graphs.

The layout_igraph_* function should not be used directly. It is only used as an argument for plotting with 'igraph'. 'ggraph' natively supports the layout.

Value

matrix of xy coordinates

References

Brandes, U., & Pich, C. (2011). More flexible radial layout. Journal of Graph Algorithms and Applications, 15(1), 157-173.

See Also

layout_centrality_group

Examples

library(igraph)

g <- sample_gnp(10, 0.4)
## Not run: 
library(ggraph)
ggraph(g, layout = "centrality", centrality = closeness(g)) +
    draw_circle(use = "cent") +
    geom_edge_link0() +
    geom_node_point(shape = 21, fill = "grey25", size = 5) +
    theme_graph() +
    coord_fixed()

## End(Not run)

graphlayouts documentation built on Sept. 30, 2024, 9:22 a.m.