How can i plot an undirected strongly connected graph in R?

【问题标题】：How can i plot an undirected strongly connected graph in R?How can i plot an undirected strongly connected graph in R?
【发布时间】：2022-12-01 21:50:21
【问题描述】：

I want to plot an undirected strongly connected graph like the uploaded picture.

I want to use the adjacency matrix in order to plot it.

I tried the igraph package in R :


data <- matrix(c(0,1,0,0,1,
                 1,0,1,0,0,
                 0,1,0,1,0,
                 0,0,1,0,1,
                 1,0,0,1,0),nrow=5,ncol = 5)
colnames(data) = rownames(data) = LETTERS[1:5]
data

network <- graph_from_adjacency_matrix(data)


plot(network)

But it creates a cycle.

Any help ?

【问题讨论】：

标签： r graph adjacency-matrix

【解决方案1】：

You need only the upper (or lower) triangle of the matrix to be 1, but 0 elsewhere. Make sure you also set mode = "undirected"

library(igraph)

data <- matrix(0, 5, 5, dimnames = list(LETTERS[1:5], LETTERS[1:5]))
data[upper.tri(data)] <- 1

data
#>   A B C D E
#> A 0 1 1 1 1
#> B 0 0 1 1 1
#> C 0 0 0 1 1
#> D 0 0 0 0 1
#> E 0 0 0 0 0

network <- graph_from_adjacency_matrix(data, mode = 'undirected')

plot(network)

【讨论】：