Re: [igraph] Help with the igraph_diameter(...)

[Gabor Csardi]

Hmmm, the docs at
http://cneurocvs.rmki.kfki.hu/igraph/doc/html/ch10s02.html#igraph_diameter
say 

path:   Pointer to an initialized vector. If not NULL the actual longest
        geodesic path will be stored here. The vector will be resized as
        needed.

So you need 

igraph_vector_t path;
igraph_vector_init(&path, 0);
igraph_diameter(&graph, &diam, &pfrom, &pto, &path, false, true);

G.

On Tue, Jan 29, 2008 at 04:06:47PM -0500, Richard Geddes wrote:
> Hi,
> 
> I'm trying to get the path for the diameter of a graph and get segfault
> errors when I use the following
> 
> 
> ---
> igraph_t graph;
> igraph_integer_t diam, pfrom, pto;
> igraph_vector_t* path;
> 
> igraph_diameter(&graph, &diam, &pfrom, &pto, path, false, true);
> 
> ---
> 
> however if I use:
> 
> igraph_diameter(&graph, &diam, &pfrom, &pto, NULL, false, true);
> 
> the execution is normal
> 
> the docs say to use an uninitialized vector pointer for path.  Did I
> miss something?
> 
> using the latest development version of igraph.
> 
> Richard
> 
> 
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-- 
Csardi Gabor <address@hidden>    UNIL DGM