graphlayouts (version 0.2.0)

backbone_layout: Backbone graph layout

Description

emphasizes a hidden group structure if it exists in the graph

Usage

layout_as_backbone(g, keep = 0.2, backbone = T)
layout_igraph_backbone(g, keep = 0.2, backbone = T, circular)

Arguments

g

igraph object

keep

fraction of edges to keep in backbone calculation

backbone

logical. Return edge ids of the backbone

circular

not used

Value

coordinates to be used layouting a graph

Details

the layout_igraph_* function should not be used directly. It is only used as an Argument for 'ggraph'.

References

Nocaj, A., Ortmann, M., & Brandes, U. (2015). Untangling the hairballs of multi-centered, small-world online social media networks. Journal of Graph Algorithms and Applications: JGAA, 19(2), 595-618.

Examples

# NOT RUN {
 library(igraph)
 library(ggraph)

 g <- sample_islands(9,20,0.4,9)
 g <- simplify(g)
 V(g)$grp <- as.character(rep(1:9,each=20))
 bb <- layout_as_backbone(g,keep=0.4)
 E(g)$col <- FALSE
 E(g)$col[bb$backbone] <- TRUE

 ggraph(g,layout="manual",node.positions=data.frame(x=bb$xy[,1],y=bb$xy[,2]))+
   geom_edge_link(aes(col=col),width=0.1,n=2)+
   geom_node_point(aes(col=grp))+
   scale_color_brewer(palette = "Set1")+
   scale_edge_color_manual(values=c(rgb(0,0,0,0.3),rgb(0,0,0,1)))+
   theme_graph()+
   theme(legend.position = "none")

# }