[igraph] Error in using graph.bipartite()

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Hi

 

I am using graph.bipartite to generate a bipartite graph.

Here is the source code and the error information:

 

> v<-0:7

> e<-c(0,4,1,6,3,7,2,6,1,5)

> g<-graph.bipartite(v,e)

error in graph.bipartite(v, e) :

  At bipartite.c:497 : Invalid (negative) vertex id, Invalid vertex id

 

Where am I making mistakes?

 

Moreover, I want to convert a directed graph into a bipartite graph by splitting each vertice into two vertices. Is there any function can do this?

 

Thanks

 

best

Xueming

 

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