问题描述
我是R语言的新手.我正在使用igraph库.我是新来的使用这种库的人.
I am new in R. I am working with igraph library. I am new using such library.
我有问题:
我在文本文件中有一个边列表.它有两列.第一个具有初始节点，第二个具有终止节点.
I have a list of edges in a text file. It has two columns. The first has initial node, the second has the ending node.
我正在使用以下文件读取文件:
I am reading the file with:
g1 <-read.table ("g1.txt")
阅读成功.
与ls.str(g1)我得到:
V1 : int [1:995] 0 0 0 0 0 0 0 0 0 0 ...
V2 : int [1:995] 2 3 4 5 6 7 8 9 10 11 ...
当我尝试用刚加载的边定义图时，我得到:
when i try to define the graph with the just loaded edges I get:
Error in graph(g1) : (list) object cannot be coerced to type 'double'
如何避免从文件边缘定义图形以避免上述错误?
How i could to define the graph from file's edges avoiding the above error?
推荐答案
正如@Sacha Epskamp所建议的那样，as.matrix可能会对此进行整理，并且可能会进行转置.
As @Sacha Epskamp suggested, as.matrix may sort this out, possibly with a transpose.
以下内容将重新创建您的错误消息，然后根据相同的数据生成一个图形
The following recreates your error message and then produces a graph from the same data
> library(igraph)
> g1 <- data.frame( V1 = c(0,0,0,0), V2 = c(2,3,4,5) )
> g1
V1 V2
1 0 2
2 0 3
3 0 4
4 0 5
>
> graph(g1)
Error in graph(g1) : (list) object cannot be coerced to type 'double'
>
> g2 <- t(as.matrix(g1))
> g2
[,1] [,2] [,3] [,4]
V1 0 0 0 0
V2 2 3 4 5
>
> graph(g2)
Vertices: 6
Edges: 4
Directed: TRUE
Edges:
[0] 0 -> 2
[1] 0 -> 3
[2] 0 -> 4
[3] 0 -> 5
这篇关于从文件读取边缘.我无法定义图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！