Hi all,

I'm making a chord diagram in R, and have question on assigning color. You can easily replicate with my code below. What I'm trying to do is to assign two different color in same section.

set.seed(999)
mat = matrix(sample(18, 18), 3, 6) 
rownames(mat) = paste0("S", 1:3)
colnames(mat) = paste0("E", 1:6)

col_mat = rand_color(length(mat), transparency = 0.5)
dim(col_mat) = dim(mat)
chordDiagram(mat, grid.col = grid.col, col = col_mat)

If you run my code, I get value of 8 for E4 of the column and S2 of the row, and plot shows only single flow with single color. What I want to do here is to seperate them into two colors (e.g. black and yellow) in order to show even though they belong to same pair (E4-S2), they are originated from different location (e.g. E4(from US)-S2 -- Black, E4(from Russia)-S2 -- Yellow).

Any brilliant idea to show this would be welcome! Thank you in advance