igraph中的修复节点

Question

我有一个有向图，其中有一个开始节点和一个结束节点，它们被定义为没有节点结束并且没有节点进入开始。在我的图中，我想修复图形顶部的节点开始和底部的中间节点之间的结束。我怎样才能做到这一点？

> final_data_graph 
      (conversion) (start)  alpha  beta  delta  epsilon  eta  gamma  iota  kappa  lambda   mi  theta 
(conversion) 0.00000000  0 0.00000000 0.00000000 0.000000e+00 0.000000000 0.00000000 0.000000000 0.00000000 0.000000000 0.00000000 0.000000e+00 0.00000000 
(start)  0.00000000  0 0.03771482 0.14413063 8.571551e-05 0.006128659 0.18025972 0.013071615 0.47426392 0.002914327 0.03891484 4.285776e-05 0.10118716 
alpha   0.18078800  0 0.58092440 0.03215991 1.049263e-04 0.017732543 0.03667174 0.002675620 0.06395257 0.005666020 0.03242222 0.000000e+00 0.03840302 
beta   0.09504413  0 0.08766124 0.35022064 8.486083e-05 0.009164969 0.24753904 0.004327902 0.12075696 0.004752206 0.02274270 0.000000e+00 0.04760692 
delta   0.53333333  0 0.00000000 0.00000000 0.000000e+00 0.066666667 0.00000000 0.000000000 0.26666667 0.066666667 0.00000000 0.000000e+00 0.06666667 
epsilon  0.38628763  0 0.13991081 0.04347826 0.000000e+00 0.105351171 0.08193980 0.005574136 0.10200669 0.007246377 0.05128205 0.000000e+00 0.05351171 
eta   0.42928641  0 0.11002583 0.09969325 0.000000e+00 0.023167582 0.19058767 0.002421698 0.07402325 0.008072328 0.01840491 0.000000e+00 0.03535680 
gamma   0.28192371  0 0.14427861 0.05804312 0.000000e+00 0.021558872 0.08291874 0.066334992 0.15754561 0.018242123 0.05306799 0.000000e+00 0.09950249 
iota   0.23902022  0 0.06370199 0.04091585 1.102111e-04 0.009202623 0.03240205 0.001790930 0.53868408 0.004573759 0.02669863 5.510553e-05 0.03160302 
kappa   0.43064985  0 0.06886518 0.03685742 9.699321e-04 0.018428710 0.06498545 0.002909796 0.09602328 0.128031038 0.05431620 0.000000e+00 0.08244423 
lambda   0.34914361  0 0.08695652 0.02561850 5.855658e-04 0.020348412 0.02547211 0.002488655 0.07539160 0.034401991 0.31620553 0.000000e+00 0.04977309 
mi    0.00000000  0 0.25000000 0.00000000 0.000000e+00 0.000000000 0.00000000 0.000000000 0.50000000 0.000000000 0.00000000 2.500000e-01 0.00000000 
theta   0.13940821  0 0.17562196 0.07949360 1.472104e-04 0.025320183 0.07198587 0.004269101 0.13513911 0.019431768 0.20491683 0.000000e+00 0.12939791 
zeta   0.09929633  0 0.15871775 0.07427678 0.000000e+00 0.039874902 0.07974980 0.001563722 0.23612197 0.007036747 0.08444097 0.000000e+00 0.07271306 
        zeta 
(conversion) 0.000000000 
(start)  0.001285733 
alpha  0.008499029 
beta   0.010098439 
delta  0.000000000 
epsilon  0.023411371 
eta   0.008960284 
gamma  0.016583748 
iota   0.011241528 
kappa  0.015518914 
lambda  0.013614405 
mi   0.000000000 
theta  0.014868247 
zeta   0.146207975 

ig <- graph.adjacency(final_data_graph, mode="directed", weighted=TRUE) 

plot(ig,edge.label=round(E(ig)$weight,3),edge.width=.01,edge.arrow.size=.05,layout=layout.reingold.tilford(ig, root=which(V(ig)$name=='(start)')),vertex.color="white") 

Answer 1

我假设你想在底部上方的起始节点和终端可绘制图表。如果是这样，您可以使用layout.reingold.tilford ：

library(igraph) 

# example graph 
g <- graph.empty(directed = T) 
g <- g + vertices(c('D','A','E','F','C','B')) 
g <- g + edge('A','B') 
g <- g + edge('A','C') 
g <- g + edge('B','E') 
g <- g + edge('B','D') 
g <- g + edge('C','D') 
g <- g + edge('D','F') 
g <- g + edge('E','F') 

# create the layout specifying the root node (i.e. start) 
ly <- layout.reingold.tilford(g, root=which(V(g)$name=='A'),flip.y=T) 
# let's plot 
plot.igraph(g,layout=ly)