Re: [igraph] Re: shortest path length

[Yong Zou]

Thanks a lot, Gabor and Tamas,

I got it.

y.

On Thu, Jun 18, 2009 at 1:49 PM, Gábor Csárdi<address@hidden> wrote:
> Yong,
>
> you need to allocate the vector(s) for the result before calling the
> function. I.e. in this case you need:
>
> igraph_ptr_t results_paths;
> igraph_vector_t result_path;
>
> [...]
>
> igraph_vector_init(&result_path, 0);
> igraph_vector_ptr_init(&result_paths, 1);
> VECTOR(result_paths)[0] = &result_path;
>
> [...]
>
> Btw. igraph_get_shortest_path will just return _one_ shortest path for every
> vertex included in 'to'.
>
> Gabor
>
> On Thu, Jun 18, 2009 at 10:32 AM, Yong Zou <address@hidden> wrote:
>>
>> Hi Tamas,
>>
>> Thanks a lot for helping me. I tried to understand how to write a
>> correct code. It seems that I always get a
>> message:"structural_properties.c:873 :Size of the `res' and the `to'
>> should match".
>>
>>  igraph_t graph;
>>  igraph_vector_ptr_t result_paths;
>>  igraph_vector_t *result_path;
>>  igraph_integer_t from_node;
>>  igraph_integer_t to_node;
>>
>>  igraph_vector_ptr_init(&result_paths, 0);
>>  from_node = 10;
>>  to_node = 1000;
>>  igraph_get_shortest_paths(&graph, &result_paths, from_node,
>> igraph_vss_1(to_node), IGRAPH_ALL);
>>  result_path = igraph_vector_ptr_e(&result_paths, 0);   // get the
>> first path in the result vector
>>  for (i=0; i<igraph_vector_size(result_path); i++) {
>>        printf("%ld ", (long)igraph_vector_e(result_path, i));
>>  }
>>  printf("\n");
>>  igraph_vector_destroy(result_path);        // destroy the path
>>  igraph_vector_ptr_destroy(result_paths);   // free all the pointers
>> and destroy the pointer list
>>
>> Best,
>>
>>
>> _______________________________________________
>> igraph-help mailing list
>> address@hidden
>> http://lists.nongnu.org/mailman/listinfo/igraph-help
>
>
>
> --
> Gabor Csardi <address@hidden>     UNIL DGM
>
>
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