Re: [igraph] Question about vector

[Tamas Nepusz]

Hi,

Please send a full code that reproduces the error. It might have
happened that your membership vector is not initialized properly for
instance. By the way, there is an easier way to treat a C array as an
igraph_vector_t, see:

http://igraph.sourceforge.net/doc-0.5/html/ch06s02s05.html

Make sure that you neither modify nor destroy vectors created this way.
Modifying the underlying array is fine.

-- 
Tamas


> vector. The code is in the following:
> 
>      int member[12000] ;
>      ..........
>      for(j=0; j<nodes; j++)  // nodes is the number of nodes in the graph
>      {
>        igraph_vector_set( &membership, j, (double) member [j] );  // member
> array stores the membership of vertices
>        printf( "%f\n", (double)VECTOR(membership)[j] );
>      }
>      igraph_modularity( &graph, &membership, &modu, NULL );
> 
> The vector membership is initialized correctly. But when running
>  igraph_modularity() function, it reports the following errors:
> 
> *** glibc detected *** ./modularity: malloc(): memory corruption (fast):
> 0x08084318 ***
> ======= Backtrace: =========
> /lib/i686/nosegneg/libc.so.6[0x45dbfc6e]
> /lib/i686/nosegneg/libc.so.6(__libc_calloc+0x94)[0x45dc0874]
> /usr/local/lib/libigraph.so.0(igraph_vector_init+0x33)[0xeb1143]
> /usr/local/lib/libigraph.so.0(igraph_modularity+0x5f)[0xf0600f]
> ./modularity[0x8048980]
> /lib/i686/nosegneg/libc.so.6(__libc_start_main+0xdc)[0x45d6ddec]
> ./modularity[0x8048691]
> 
> So, I am a bit confused. Where is wrong?
> -- 
> Thanks
> zhengjun
> 
> Graduate research assistant
> Dept of Computer Science and Engineering
> Lehigh University

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