R: radial centrality layout

layout_centrality {graphlayouts} | R Documentation

## 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.

### Examples

    library(igraph)
    library(ggraph)

    g <- sample_gnp(10,0.4)
    ## Not run:
    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)

[Package graphlayouts version 0.8.0 Index]