Compliance with Matrix package

[ebridge2]

Hi,

I am having difficulty using the sparse matrices supplied by the Matrix package with the reshape package. Example, using a dgCMatrix:

require(Matrix)
(m <- Matrix(c(0,0,2:0), 3,5))
str(m)
m[,1]
melt(m)

This is problematic as igraph by default in the as_adj method produces dgCMatrix objects, making it difficult to use with the reshape2 package without internal conversion scripts.