# layout_centrality: radial centrality layout In schochastics/graphlayouts: Additional Layout Algorithms for Network Visualizations

## Description

arranges nodes in concentric circles according to a centrality index.

## Usage

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18``` ```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

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13``` ```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) ```

schochastics/graphlayouts documentation built on March 14, 2020, midnight