[R] coloring edges in IGRAPH

[Bogdan Tanasa]

Dear all,

I would appreciate a piece of advice please : I am aiming to color the
edges in a graph, by using IGRAPH package.

It works well for the big braph, however, when I decompose the graph into 2
subgraphs and color code those, the color of the edges change
(unexpectedly).

more precisely, as an example -- we have a dataframe :

el <- data.frame(Partner1=c(1, 3, 4, 5, 6), Partner2=c(2, 2, 5, 7, 7),
TYPE=c("DEL", "DEL", "DUP", "TRA", "TRA"))

el$COLOR[el$TYPE=="DEL"] <- "red"

el$COLOR[el$TYPE=="DUP"] <- "green"

el$COLOR[el$TYPE=="INS"] <- "yellow"

el$COLOR[el$TYPE=="INV"] <- "brown"

el$COLOR[el$TYPE=="TRA"] <- "blue"

#> el
#  Partner1 Partner2 TYPE COLOR
#1        1        2  DEL   red
#2        3        2  DEL   red
#3        4        5  DUP green
#4        5        7  TRA  blue
#5        6        7  TRA  blue

g <- graph_from_data_frame(d = el, directed = TRUE)

plot(g, edge.color=el$COLOR)

### here decomposing the graph into 2 SUBGRAPHS :

g_decompose <- decompose.graph(g)

plot(g_decompose[[1]], edge.color=el$COLOR) ## here the edges are red (that
is fine)

plot(g_decompose[[2]], edge.color=el$COLOR) ## here the edges shall be blue
and green, not red and green .

#####################################################

many thanks !

-- bogdan

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