Nothing
g1 <- function() {
nodes <- data.frame(
stringsAsFactors = FALSE,
id = letters[1:5]
)
edges <- data.frame(
stringsAsFactors = FALSE,
from = c("a", "b", "c", "a", "b", "e"),
to = c("b", "a", "c", "e", "d", "a")
)
graph(nodes, edges)
}
g2 <- function() {
nodes <- data.frame(
stringsAsFactors = FALSE,
id = letters[1:5]
)
edges <- data.frame(
stringsAsFactors = FALSE,
from = character(),
to = character()
)
graph(nodes, edges)
}
g3 <- function() {
nodes <- data.frame(
stringsAsFactors = FALSE,
id = character()
)
edges <- data.frame(
stringsAsFactors = FALSE,
from = character(),
to = character()
)
graph(nodes, edges)
}
g4 <- function() {
nodes <- data.frame(
stringsAsFactors = FALSE,
id = letters[1:5]
)
edges <- data.frame(
stringsAsFactors = FALSE,
from = c("a", "b", "a", "a", "b", "e"),
to = c("b", "a", "e", "e", "d", "a")
)
graph(nodes, edges)
}
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