[英]How to minimize the number of edge crossings with diagrammer, R?
當我使用制圖器繪制網絡圖時,如下面的玩具示例...
library(DiagrammeR)
Dia <- function(edg, nodesd) {
nodes <- create_node_df( n=length(nodesd), label=nodesd,
width=0.3)
edges <- create_edge_df(from = edg$EveFrom, to = edg$EveTo,
rel = "leading_to")
graph <- create_graph( nodes_df = nodes, edges_df = edges)
render_graph(graph)
}
niv <- c("A","B","C","D","E","X","Y")
temp <- data.table(EveFrom=factor(c("A","A","A","A","B","C","D","E",
"X", "B"), levels=niv),
EveTo=factor(c("B","C","D","E","X","X","Y","Y","Y", "C"), levels=niv))
Dia(temp,niv)
我如何告訴制圖師自動最小化邊緣交叉的數量?
在這個簡單的例子中,如果 C 和 B 位置交換,結果不會有任何邊緣交叉。 在更復雜的例子中,我們不能刪除所有交叉,但至少可以將其最小化。
使用 visnetwork 我可以重新定位節點
但它還有其他缺點,例如它不允許您將其導出為矢量圖形。
使用dot
布局選項(靈感來自此處)
# install.packages(c("DiagrammeR"), dependencies = TRUE)
library(DiagrammeR)
grViz("
digraph dot {
graph [layout = dot] # dot, neato, twopi, and circo
A -> {B C D E}
B -> {C X}
C -> {X}
D -> {Y}
E -> {Y}
X -> {Y}
}")
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