>
> Two years ago, as shown in the script at the end, I created shortestpaths
> using Igraph, then using Melt in Reshape2 I converted the the resulting
> matrix into
> three column vectors - "vertex1", "vertex2", "shortestpath". It worked
> then.



> However, in the meantime I have installed new versions of R and these two
> libraries. Creating column vectors with names of rows and columns don't
> work anymore; the name columns are mostly blank. Could anyone suggest a
> solution, preferably not dependent on a library, given my bad experience
> with Reshape2?




> Below is the original code
>
> #code for generating shortest path matrix and creating a 3 columns
> from an igraph graph object "y"
> y_s<-shortest.paths(y,  weights = NULL)
> y_s <- melt(y_s)[c(upper.tri(y_s)),]
> y_s[,1] <- V(y)$name[y_s[,1]]
> y_s[,2] <- V(y)$name[y_s[,2]]
> names(y_s)<-c("vertex1", "vertex2", "shortestpath")
>
>
> Best regards,
> Joe.
>

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