[igraph] Non-atomic attributes?

[Dan Auerbach]

Apologies if I've missed something obvious, but a search through the list archives and the help and documentation on the igraph homepage hasn't helped so far...

Using 2.8.1 and 0.5.1,

In the R-igraph help it is stated:

"In recent igraph versions, arbitrary R objects can be assigned as graph, vertex or edge attributes."

I took this to mean that, for example, a vertex attribute could consist of vectors, matrices, lists, etc., but I can't seem to assign a vector as a vertex attribute, e.g.

>g=graph.lattice(c(3,1))

>V(g)[1]$test = c(1,2,3,4)

Warning message:

In graph[[9]][[3]][[name]][index + 1] <- value :

  number of items to replace is not a multiple of replacement length

> V(g)$test

[1] NA  1 NA

I've tried assigning pre-declared objects, e.g.

>a= c(1,2,3,4..)

>V(g)[1]$test = a

and assignments to all vertices first (rather to a than a single vertex index), 

and I've tried to set the dim() on attributes,

but so far I can't assign anything other than atomics.

I can get around this with arrays that are referenced by vertex id, but it would be nice to integrate the info into the single graph data structure.

Am I misinterpreting the package capabilities or making an obvious error (like somehow declaring the attribute class?)

Thanks 

Dan Auerbach 

970-491-2414

Graduate Degree Program in Ecology

Dept. of Biology

Colorado State Univ.

Fort Collins, CO 80523-1878