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## Re: [igraph] to attach edge weights

 From: MATSUDA, Noriyuki Subject: Re: [igraph] to attach edge weights Date: Thu, 29 Nov 2007 17:30:52 +0900

```Hi Gabor:

Thanks a lot.  Yes, it works.

At 8:50 AM +0100 07.11.29, Gabor Csardi wrote:
```
```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

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

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
E(g)\$weight ???????

--
MATSUDA, Noriyuki　<in Kanji> 松 田 紀 之

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```
```
--
Csardi Gabor <address@hidden>    MTA RMKI, ELTE TTK

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```
```

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MATSUDA, Noriyuki　<in Kanji> 松 田 紀 之

```