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## Re: [igraph] to attach edge weights

**From**: |
Gabor Csardi |

**Subject**: |
Re: [igraph] to attach edge weights |

**Date**: |
Thu, 29 Nov 2007 08:50:51 +0100 |

**User-agent**: |
Mutt/1.5.13 (2006-08-11) |

The easiest is to use the 'weighted' argument of graph.adjacency:
m<- rbind(c(1, 0.2, 0.6), c(0.2, 1, 0.8), c(0.6, 0.8, 1))
diag(m) <- 0
m[ m<0.5 ] <- 0
g <- graph.adjacency(m, weighted=TRUE)
Although i just noticed that 'weighted' and 'upper' don't work
well together, so if you want to create an undirected graph
here is a workaround:
m<- rbind(c(1, 0.2, 0.6), c(0.2, 1, 0.8), c(0.6, 0.8, 1))
diag(m) <- 0
m[ m<0.5 ] <- 0
m[ lower.tri(m) ] <- 0
g <- graph.adjacency(m, weighted=TRUE, mode="undirected")
Gabor
On Thu, Nov 29, 2007 at 11:42:36AM +0900, MATSUDA, Noriyuki wrote:
>* Hello:*
>* *
>* I'd be happy if any one can tell me how to attach edge weights on*
>* the basis of a connectedness/similarity matrix. Suppose I do the*
>* following for a 3 by 3 correlation matrix*
>* m<- rbind(c(1, 0.2, 0.6), c(0.2, 1, 0.8), c(0.6, 0.8, 1))*
>* m(diag)<-NA;*
>* m[m(a)<0.5] <-0; m[m(a)>=0.5] <-1 #There must be a better way*
>* g<-graph.adjacency(m, mode="upper"] #upper includes diagonals*
>* E(g)$weight ???????*
>* *
>* Thanks in advance*
>* -- *
>* MATSUDA, Noriyuki <in Kanji> 松 田 紀 之*
>* *
>* *
>* _______________________________________________*
>* igraph-help mailing list*
>* address@hidden*
>* http://lists.nongnu.org/mailman/listinfo/igraph-help*
--
Csardi Gabor <address@hidden> MTA RMKI, ELTE TTK