scientific notation break graph.data.frame with vertices argument

[R Vesco]

Using the graph.data.frame function along with a vertices data.frame will complain that there exists vertices in the edgelist that do not exist the in vertices dataframe.

The cause for this bug has something todo with scientific notation which creates duplicate vertices for numbers such as

100000 200000 and so on....

The workaround for this bug is to disable scientific notation:

options(scipen=999)

Then the function graph.data.frame will work as expected.

[Gábor Csárdi (gabor.csardi)]

Thanks for your report!

I think this happens, if the symbolic names are not of type character for one argument and character for the other. E.g.

library(igraph)
verts <- data.frame(id=c("1001", "100000", "200000"))
dat <- data.frame(from=c(1001, 100000, 200000), to=c(100000, 200000, 100000))
g <- graph.data.frame(dat, vertices=verts)

An easy workaround is to convert everything to character. But I'll add the options(scipen) to graph.data.frame anyway.

[Gábor Csárdi (gabor.csardi)]

Fixed in revisions 3018 (0.6-main) and 3068 (0.7-main).

[Gábor Csárdi (gabor.csardi)]

The development of igraph has moved to github, so please do not comment on this bug here. You are of course welcome to comment on github, here:
https://github.com/igraph/igraph/issues/301