Re: [igraph] Nodes properties

[Gábor Csárdi]

Please send complete code that reproduces the error. Thanks. G.

On Tue, Jan 13, 2015 at 11:55 AM, Daniel Penalva <address@hidden> wrote:

i setted igraph_i_set_attribute_table(&igraph_cattribute_table) in the  int main(void)

On Tue, Jan 13, 2015 at 2:46 PM, Daniel Penalva <address@hidden> wrote:

Hi

Iam trying to use this interface, but got a error when encapsulated the functions inside another, eg:

void  f(igraph_t g, double prickles){

igraph_real_t good = prickles;

SETGAN(&g, "food", good);

}

got a error:

vector_ptr.c:258: igraph_vector_ptr_size: Assertion `v != ((void *)0)' failed.

any hint ? thank-you

On Mon, Jan 12, 2015 at 2:25 PM, Daniel Penalva <address@hidden> wrote:

thank you

On Mon, Jan 12, 2015 at 7:56 AM, Tamas Nepusz <address@hidden> wrote:

Hi,

> How can i add properties to the nodes of a graph ? Iam using igraph with C
> language.
Please refer to http://igraph.org/c/doc/igraph-Attributes.html

> I want to add:
>
> char *
> doubles
> int
>
> and access by the adjacency matrix structure.  Is there any doc to this ?
igraph does not use adjacency matrices to represent a graph. If you want to
retrieve an attribute corresponding to an edge, you have to query the ID of the
edge first using igraph_get_eid() and then retrieve the attribute of interest
using igraph_cattribute_EAN() for numeric attributes, igraph_cattribute_EAS()
for string attributes, or igraph_cattribute_EAB() for booleans.

--
T.

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