Re: [igraph] Problems reading the number of vertices of a pajek-file using C-Igraph in a 64-bits machine

[Charles Novaes de Santana]

Thank you guys, for your quick answer!

Tamas: I understand what you say. I tried exactly the same casting you
suggested me, but unfortunately nothing changed. In attach I am
sending the source file (as I said, it is the same "foreign.c" that is
in the igraph manual).

Gábor: I am sending also the output of the ldd foreign, the commands I
use to compile it, the way I run it (./foreign), and the output I got
when I run it. I hope it helps us to understand what it is happening.

I was wondering if it may be an error because I am compiling the
igraph in my home, and so because of it I am doing something wrong
when I am linking the libraries during the compilation.

Thank you for your attention,

Best,

Charles

On Mon, Dec 10, 2012 at 10:45 AM, Tamás Nepusz <address@hidden> wrote:
> Dear Charles,
>
>> number of vertices of a network from in simple pajek file. The program
>> compiles correctly, it reads the edges of the network correctly, but
>> it reads the number of vertices like a strange number, like -10585152.
> I'm 99% sure that this is a printing/formatting issue, i.e. the number in the 
> variable is fine but you print it with the wrong format string. The reason 
> why it happens on a 64-bit machine only is because the variable type that 
> printf expects for that particular format string that you are using happens 
> to be of the same length as your actual variable on a 32-bit machine but not 
> on a 64-bit machine.
>
> For the record, igraph_vcount returns the vertex count in an 
> igraph_integer_t. _Internally_, igraph_integer_t used to be a double before 
> igraph 0.6, but that confused the hell out of people (including me) so we 
> switched to igraph_integer_t being a long int. That being said, the safest 
> way to print an igraph_integer_t is by casting it explicitly to a long int to 
> make sure that the code works with every igraph version:
>
> igraph_integer_t whatever;
> [...]
> printf("whatever = %ld\n", (long int)whatever);
>
> Best,
> Tamas
>
>
> _______________________________________________
> igraph-help mailing list
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> https://lists.nongnu.org/mailman/listinfo/igraph-help



-- 
Um axé! :)

--
Charles Novaes de Santana
http://www.imedea.uib-csic.es/~charles
PhD student - Global Change
Laboratorio Internacional de Cambio Global
Department of Global Change Research
Instituto Mediterráneo de Estudios Avanzados(CSIC/UIB)
Calle Miquel Marques 21, 07190
Esporles - Islas Baleares - España

Office phone - +34 971 610 896
Cell phone - +34 660 207 940

run_foreign.sh
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output_foreign.dat
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ldd_foreign.dat
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foreign.c
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compile_foreign.sh
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LINKS.NET
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