Re: [igraph] adding weights on edges

[Laís Mozzaquattro]

I'm having a problem with calculating the shortest.path of a graph. 

dist.contra.fluxo<-shortest.paths(forqueta.ligeiro.contra.fluxo,v=V(forqueta.ligeiro.contra.fluxo), to=V(forqueta.ligeiro.contra.fluxo), mode='out')

The error that I'm getting is:

 Erro em shortest.paths(forqueta.ligeiro.dire.fluxo, v = V(forqueta.ligeiro.dire.fluxo),  : 

  At structural_properties.c:5011 : Weight vector length does not match, Invalid value

But I have checked the lenght of my edge sequence and weight vector, and both are 15. 

> length(E(forqueta.ligeiro.contra.fluxo))

[1] 15

> length(E(forqueta.ligeiro.contra.fluxo)$weights)

[1] 15

Where should be the problem?

Thank you.

Laís Bohrer Mozzaquattro
Bacharel em Ciências Biológicas, ênfase em Gestão Ambiental Marinha e Costeira
Mestranda em Ecologia - UFRGS

2013/10/9 Laís Mozzaquattro <address@hidden>

Thank you very much!

Laís Bohrer Mozzaquattro
Bacharel em Ciências Biológicas, ênfase em Gestão Ambiental Marinha e Costeira
Mestranda em Ecologia - UFRGS

2013/10/9 Gábor Csárdi <address@hidden>

Hi, e.g.

E(forqueta.ligeiro)$weight <- rowSums(custos, na.rm=TRUE)

or you can create the graph with edge weight in the first place, from a data frame, using graph.data.frame(). See

?"igraph-package"

?graph.data.frame

?set.edge.attribute

?E

for details.

Gabor

On Wed, Oct 9, 2013 at 2:22 PM, Laís Mozzaquattro <address@hidden> wrote:

I'm new in igraph and R and i'm having some trouble to add weights is edges on a graph that I created. The only way that I found to do it is by adding it one by one, like this:

forqueta.ligeiro[1,2,attr="weight"]<-sum(custos[1,],na.rm=T)

forqueta.ligeiro[2,3,attr="weight"]<-sum(custos[2,],na.rm=T)

forqueta.ligeiro[3,4,attr="weight"]<-sum(custos[3,],na.rm=T)

and so on...

My problem is that I have a big graph, with at least 90 edges, and I want to know if there's a more automatic way to do it, like inserting a vector with all my weight on the edges of a graph.

Thank you!

Laís Bohrer Mozzaquattro

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