Description Usage Arguments Details Value References Examples

arranges nodes in concentric circles according to a centrality index.

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
)
``` |

`g` |
igraph object |

`cent` |
centrality scores |

`scale` |
logical. should centrality scores be scaled to |

`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 |

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.

matrix of xy coordinates

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

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)
``` |

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