CODEWITHSUNDEEP
rnetwork-programmingigraph
MCS
MCS

Reputation: 1101

Negative degree igraph

I am trying to get basic stats from a not-directed igraph object I created. When using the simple degree function i get negative numbers, what went wrong?

col_1 <- as.vector(as.character(df$names_1))
col_2 <- as.vector(as.character(df$names_2))
vector <- rbind(col_1,col_2)
g <- graph(vector, directed = FALSE)

head(sort(desc(degree(g, loops = FALSE, normalized = FALSE))))

Sorry for not being able to produce an example because of privacy issue. Thanks

Upvotes: 0

Views: 118

Answers (1)

G5W
G5W

Reputation: 37661

degree does not produce negative numbers. desc does.

Since you do not provide any data, I will illustrate with an arbitrary graph. 

library(igraph)
library(plyr)

set.seed(1234)
g = erdos.renyi.game(15, 0.2)

degree(g, loops = FALSE, normalized = FALSE)
 [1] 3 3 5 1 5 4 2 6 4 3 3 5 3 1 6
desc(degree(g, loops = FALSE, normalized = FALSE))
 [1] -3 -3 -5 -1 -5 -4 -2 -6 -4 -3 -3 -5 -3 -1 -6

If you want to sort the degrees in descending order try

sort(degree(g, loops = FALSE, normalized = FALSE), decreasing=TRUE)
[1] 6 6 5 5 5 4 4 3 3 3 3 3 2 1 1

Upvotes: 2

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