Correctly color vertices in R igraph

Question

I am using igraph to color vertices

I have two CSV files answers and topology of the graph.

Answers: (this tells that players K and N answered correctly)

Answer 1

The easiest is to create the graph with all meta data included and then igraph takes care of the rest. E.g.

library(igraph)

answers <- read.table(textConnection(
   "  Player Q1_I1                                                             
    1      k     1                                                             
    2      l     0                                                             
    3      n     1                                                             
    4      m     0                                                             
"))

topology <- read.table(textConnection(
   "  Node.1 Node.2                                                            
    1      k      l                                                            
    2      l      k                                                            
    3      l      m                                                            
    4      m      l                                                            
    5      l      n                                                            
    6      n      l                                                            
    7      n      k                                                            
    8      k      n                                                            
 "))

g2 <- graph.data.frame(topology, vertices=answers, directed=FALSE)
g <- simplify(g2)
V(g)$color <- ifelse(V(g)$Q1_I1 == 1, "lightblue", "orange")

plot(g)

But, actually if you don't include each edge in both directions in your data table, then you don't even need to call simplify.