Re: [igraph] Wierd behavior of graph.adjacency ?

[Ester López]

Hi Gabor,

Thanks a lot! :)

Kind regards,
Ester
On 07/17/2012 07:50 PM, Gábor Csárdi wrote:
> Hi Ester,
>
> I am sorry for the delay. This is a known bug:
> https://bugs.launchpad.net/igraph/+bug/1019624
>
> It happens because graph.adjacency does not work if the input matrix
> contains integers. The workaround is to convert your matrix to
> "numeric" (which means "double", really) before calling
> graph.adjacency:
>
> mode(mat) <- "numeric"
> graph.adjacency(mat, ...)
>
> Best,
> Gabor
>
> On Tue, Jul 10, 2012 at 3:51 AM, Ester Lopez <address@hidden> wrote:
> > Hi all,
> >
> > I'm trying to read some directed graphs from a file which looks like:
> >
> > > > > cat losses1/257-data.826460.84-2419_10_3net.in
> > > > 1 0 3 0 0 0 3 0 3 0
> > > >
> > > > 0 1 0 0 0 3 0 0 0 3
> > > >
> > > > 3 0 0 0 0 0 0 0 0 0
> > > >
> > > > 0 0 0 0 3 0 0 0 0 0
> > > >
> > > > 0 0 0 3 1 3 0 3 0 0
> > > >
> > > > 0 3 0 0 3 1 3 0 0 0
> > > >
> > > > 3 0 0 0 0 3 0 0 0 0
> > > >
> > > > 0 0 0 0 3 0 0 0 0 0
> > > >
> > > > 3 0 0 0 0 0 0 0 1 0
> > > >
> > > > 0 3 0 0 0 0 0 0 0 0
> >
> >   Which represents the weighted adjacency matrix. When I read the file in R:
> >
> > > > mat <- read.table('losses1/257-data.826460.84-2419_10_3net.in')
> > > > mat <- read.table('losses1/257-data.826460.84-2419_10_3net.in')
> > > > mat <- as.matrix(mat)
> > > > mat
> > >        V1 V2 V3 V4 V5 V6 V7 V8 V9 V10
> > >   [1,]  1  0  3  0  0  0  3  0  3   0
> > >   [2,]  0  1  0  0  0  3  0  0  0   3
> > >   [3,]  3  0  0  0  0  0  0  0  0   0
> > >   [4,]  0  0  0  0  3  0  0  0  0   0
> > >   [5,]  0  0  0  3  1  3  0  3  0   0
> > >   [6,]  0  3  0  0  3  1  3  0  0   0
> > >   [7,]  3  0  0  0  0  3  0  0  0   0
> > >   [8,]  0  0  0  0  3  0  0  0  0   0
> > >   [9,]  3  0  0  0  0  0  0  0  1   0
> > > [10,]  0  3  0  0  0  0  0  0  0   0
> > > > gr <- graph.adjacency(mat, weighted=TRUE)
> > > > get.adjacency(gr, sparse=FALSE)
> > >      V1 V2 V3 V4 V5 V6 V7 V8 V9 V10
> > > V1   1  1  0  1  1  1  1  0  1   0
> > > V2   1  0  1  0  0  1  1  1  1   1
> > > V3   0  0  1  1  0  1  1  1  1   1
> > > V4   1  0  1  0  0  1  1  1  1   1
> > > V5   1  0  0  0  1  1  1  1  1   0
> > > V6   1  0  1  0  1  1  1  1  1   1
> > > V7   0  0  0  0  0  1  0  1  0   1
> > > V8   1  1  1  1  0  1  1  1  1   1
> > > V9   0  0  1  0  0  1  1  1  1   1
> > > V10  1  0  0  0  0  1  1  1  1   1
> > >
> > > > E(gr)[2]$weight
> > > [1] 1.482197e-323
> >
> > I've tried creating by my own the same matrix manually and it works just
> > fine, but Im not sure why, when I load it from the file it behaves like
> > this. Also the results slightly differ if I change the dimnames(mat), but
> > yet not the correct ones.
> >
> > I'm using igraph "0.6-2" version.
> >
> > Any idea about what I'm doing wrong?
> >
> > Thanks a lot,
> > Ester
> >
> >
> >
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