Re: [igraph] Accessing the isomorphisms returned by igraph_get_isomorphisms_vf2

[Gábor Csárdi]

Yep, this is correct, basically the igraph_vector_ptr_t contains
pointers to igraph_vector_t objects. (So this is a poor man's list,
really.)

You can use VECTOR(maps)[i] instead of igraph_vector_ptr_e(&maps, i),
it can be slightly faster, as it is a macro and not a function call.

Gabor

On Mon, Mar 2, 2009 at 7:48 AM, Jyothish Soman <address@hidden> wrote:
> This is code i wrote for some other purpose, but i suppose will work here.
>
>
> int n,i,k;
> long int temp;
>         n=igraph_vector_ptr_size(&maps);
>         for(i=0;i<n;i++)
>         {
>                 igraph_vector_t *v;
>                 v=igraph_vector_ptr_e(&maps,i);          //v will store each
> of the permutations.
>
>                         for(k=0;k<igraph_vector_size(v);k++)
>                         {
>                                 temp=(long int)VECTOR(*v)[k];
> //here temp will take out each component from the vector
>
>                         }
>
>         }
> **To rest of the community: This is my first reply here**
>
> On Mon, Mar 2, 2009 at 11:47 AM, Mark McClure <address@hidden> wrote:
>>
>> How can I access the isomorphisms returned by
>> igraph_get_isomorphisms_vf2 (and presumably related
>> functions)?  Evidently, they're stored in a pointer
>> to an igraph_vector_ptr_t, but I've no idea how to
>> access the individual mappings as lists.
>>
>> Here's a simplified snippet of what I've got so far:
>>
>> ----------------
>> // Create a complete graph on 3 vertices.
>> igraph_real_t edges[] = { 0, 1, 1, 2, 2, 0 };
>> igraph_vector_view(&v, edges, sizeof(edges)/sizeof(double));
>> igraph_create(&graph, &v, 0, IGRAPH_UNDIRECTED);
>>
>> igraph_vector_ptr_t maps;
>> igraph_vector_ptr_init(&maps, 1);
>> int status = igraph_get_isomorphisms_vf2(&graph, &graph, &maps);
>> int size = igraph_vector_ptr_size(&maps);
>> ------------------
>>
>> At this point, I guess the mappings are stored in maps.  Also,
>> my status variable returns 0 and size returns 6; I guess these
>> are both good.  But again, how can I access the actual
>> permutations?
>>
>> Thanks for any assistance,
>> Mark McClure
>>
>>
>> _______________________________________________
>> igraph-help mailing list
>> address@hidden
>> http://lists.nongnu.org/mailman/listinfo/igraph-help
>>
>
>
>
> --
> JYOTHISH SOMAN
>
> --------------------------------------------------------------
> The reasonable man adapts himself to the world; the unreasonable one
> persists in trying to adapt the world to himself. Therefore, all progress
> depends on the unreasonable man.
>    George Bernard Shaw
> --------------------------------------------------------
>
>
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>



-- 
Gabor Csardi <address@hidden>     UNIL DGM