Re: [igraph] Laplacian Matrix

[Vincent Matossian]

so sorry about my previous post. I had completely overlooked the graph.laplacian method. Thanks for pointing it out!
plus my implementation shouldn't even be called a laplacian as I had it consider loops and directedness...

Best,

Vincent

On 11/26/06, Gabor Csardi <address@hidden> wrote:

Vincent,

thanks! Actually in the R interface there is a function called
graph.laplacian which returns the Laplacian matrix, but you're right that it
is not part of the C interface. Personally I would not put this in
igraph_get_adjacency, but would be happy with a separate igraph_laplacian
function. Probably this is only a matter of taste.... First could you check
whether your implementation and graph.laplacian give the same results (for a
couple of randomly generated graph) and if they do i'll add your code as
igraph_laplacian.

Thanks again,
Gabor

On Sun, Nov 26, 2006 at 08:44:42PM -0500, Vincent Matossian wrote:
>
>  Hi,
>
> I modified my working 0.3 (from the tar gz now available online), such that
> get.adjacency can also return a Laplacian matrix. This is a trivial change
> (although I hope I didn't mess it up), and I am attaching the associated
> changes to this mail.
>
> In this process:
>
> conversion.c igraph.h conversion.R conversion.Rd
>
> had to be modified.
>
> This feature is relevant to me but I don't know if it is to others. Gabor you
> are more than welcome to include it if you deem it correct (: and relevant
>
> Cheers,
>
> Vincent


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


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