Re: [igraph] graph.adjacency() doesn't name edge attribute as "weighted" argument

[Gábor Csárdi]

Hi,

thanks for the detailed report, I have just fixed this in the
development tree, it will be included in the next release. In the mean
time, you can simply rename (=copy and delete the old) attribute as a
workaround.

Best,
Gabor

On Mon, Oct 15, 2012 at 11:53 AM, Raffaele Vacca
<address@hidden> wrote:
> Hi,
>
> there seem to be a little problem with the argument "weighted" in
> graph.adjacency().
>
> According to igraph manual the "weighted" argument of that function does the
> following:
> "If it is a character constant then for every non-zero matrix entry an edge
> is created and the value of the entry is added as an edge attribute named by
> the weighted argument. If it is TRUE then a weighted graph is created and
> the name of the edge attribute will be weight. See also details below."
>
> However, when set at a character constant, "weighted" fails to name the edge
> attribute it creates. It does create an edge attribute with the matrix
> entries, but that attribute is not named after the "weighted" argument. It's
> named "weight" just like if the argument was set as "weighted= TRUE".
>
> --------------------------------------------------------------------------------------
> # Sample adjacency matrix of 5 rows and 5 columns.
> # Its entries are probabilities of the edge and can be 0, 0.5 or 1.
> set.seed(1234)
> adjacency <- matrix(sample(c(0, 0.5, 1), size= 5*5, replace= TRUE), nrow= 5,
> ncol= 5)
>
> # Import graph from "adjacency" and try to set the matrix entries as edge
> attribute named "prob"
> graph.adjacency(adjmatrix= adjacency,
>                 mode= 'upper',
>                 weighted= 'prob',
>                 diag= FALSE)
>
> # In the output value, that edge attribute is actually named "weight".
> # Just like if it was "weighted= TRUE".
> graph.adjacency(adjmatrix= adjacency,
>                 mode= 'upper',
>                 weighted= TRUE,
>                 diag= FALSE)
>
> --------------------------------------------------------------------------------------
>
>
>
> --
> * Raffaele Vacca *
> PhD candidate Urban and Local European Studies
> Department of Sociology and Social Research
> Università degli Studi di Milano-Bicocca
> Room 208, II Floor
> Via Bicocca degli Arcimboldi, 8
> 20126, Milano
> address@hidden
>
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-- 
Gabor Csardi <address@hidden>     MTA KFKI RMKI