[英]igraph and read.table, isolated vertices in R
I saw that igraph in R requires data structured like this: 我看到R中的igraph需要这样的数据结构:
nodeA nodeB int_1 int_2
AA BD 6 X
BD CA 8 Y
AA DE 7 Y
... ... ... ...
And I saw that through 我看到了
data<-read.table(file)
graph.data.frame(data)
I obtain the corresponding network. 我获得了相应的网络。
Now say I have to put in isolated nodes, I searched in the documentation but could not find anything that answered my issue. 现在说我必须放置隔离的节点,我在文档中进行了搜索,但是找不到任何可以解决我的问题的东西。
How can I specify them in the original file? 如何在原始文件中指定它们?
I thought of something like (like a .sif format) 我想到了类似的东西(如.sif格式)
nodeA nodeB int_1 int_2
AA DE 7 Y
... ... ... ...
isoNodeA
isoNodeB
...
but obviously the read.table does not accept different number of fields between rows. 但显然read.table不能接受行之间不同数量的字段。
You could try it like this: 您可以这样尝试:
data<-read.table(header=T, fill = TRUE, stringsAsFactors=F, text="
nodeA nodeB int_1 int_2
AA BD 6 X
BD CA 8 Y
AA DE 7 Y
ZZ
DE BD 7 Y")
data[data==""] <- NA
library(igraph)
g <- graph.data.frame(
data[complete.cases(data),],
vertices = unique(na.omit(unlist(data[1:2]))))
plot(g)
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