This is the ‘OrRd’ palette from https://colorbrewer2.org/. It has at most nine colors.
Use this palette, if vertex colors mark some ordinal quantity, e.g. some centrality measure, or some ordinal vertex covariate, like the age of people, or their seniority level.
library(igraphdata) data(karate) karate <- karate %>% add_layout_(with_kk()) %>% set_vertex_attr("size", value = 10) #> This graph was created by an old(er) igraph version. #> Call upgrade_graph() on it to use with the current igraph version #> For now we convert it on the fly... V(karate)$color <- scales::dscale(degree(karate) %>% cut(5), sequential_pal) plot(karate)