> My question is: how to convert the list 'sbg.triangle[[1]] = a, b, c' > into 'a,b, b,c, c,a'? Something like this would work:
> edges_of_triangle <- function (x) { c(x[1], x[2], x[2], x[3], x[3], x[1]) }
> edges_of_triangle(c("A", "B", "C"))
[1] "A" "B" "B" "C" "C" "A"
T.
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