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) V(karate)$color <- scales::dscale(degree(karate) %>% cut(5), sequential_pal) plot(karate)