RG#94: Arch Diagram

# 'devtools' need to be installed if not installed 
install.packages("devtools") 

# load devtools
library(devtools)

# install 'arcdiagram'
install_github('arcdiagram',  username='gastonstat')

 library(arcdiagram)

# star graph with 20 nodes
star_graph = graph.star(20, mode="out")

# extract edgelist
staredges = get.edgelist(star_graph)

# default arc diagram
arcplot(staredges)

 # different ordering, arc widths, arc colors, and node sizes
set.seed(1234)
orderv <- sample (1:20)
labelv <- paste("nd",1:20,sep="-")
archlinewd <- 4*runif(20,.5,2)
colarcs <- heat.colors (19)
 nodesize <- runif(20,1,3)
arcplot(staredges, ordering=orderv, labels= labelv,
   lwd.arcs= archlinewd, col.arcs= colarcs,
   show.nodes=TRUE, pch.nodes=21, cex.nodes= nodesize,
   col.nodes="lightseagreen", bg.nodes="midnightblue", lwd.nodes= 2)