Re: [igraph] Invalid (negative) vertex id, Invalid vertex id

[Tamas Nepusz]

Hi Christian,

> But if you only want to see the code, is it:
I guess somehow you manage to add negative numbers to the "edges"  
vector in fetch_edges. I mean this part of the code:

> static int fetch_edge(HeapTuple *tuple, TupleDesc *tupdesc, long int  
> i, pgr_edge_columns_t *edge_columns,
>           igraph_vector_t *edges, igraph_vector_t *weights,  
> igraph_vector_t *eids,
>           igraph_vector_t *vertex, bool directed)
> { [...] VECTOR(*eids)[i] = DatumGetInt32(id_binval);
>  VECTOR(*edges)[(2*i)] = DatumGetInt32(s_binval);
>  VECTOR(*edges)[(2*i) + 1] = DatumGetInt32(t_binval);
>  VECTOR(*weights)[i] = DatumGetFloat8(c_binval);
I have a feeling that either DatumGetInt32(s_binval) or  
DatumGetInt32(t_binval) returns -1 for some reason and that's why you  
are having the error. Please check explicitly whether you have  
negative values in the "edges" vector before calling igraph_create --  
you can use igraph_vector_min() to check that easily.

--
Tamas