Ok, the problem seems simpler than I thought. It works well if omit two
lines:
y_s[,1] <- V(y)$name[y_s[,1]]
y_s[,2] <- V(y)$name[y_s[,2]]
It seems melt creates a data.frame (unlike what it did two years ago?)
Joe
On Tue, Aug 27, 2013 at 12:35 AM, Joseph J. Bakker <joe.st...@gmail.com>wrote:
> 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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