32 bits :) On Wed, Dec 5, 2012 at 10:06 PM, Gábor Csárdi <[email protected]> wrote: > PC, I guess. 64 bit or 32 bit? > > G. > > > On Wed, Dec 5, 2012 at 4:04 PM, Charles Novaes de Santana > <[email protected]> wrote: >> >> Sorry. I am using Gcc 4.6.3 on a Ubuntu 12.04. >> >> Thanks, >> >> Charles >> On Wed, Dec 5, 2012 at 10:01 PM, Gábor Csárdi <[email protected]> wrote: >> > Charles, >> > >> > what is your platform? OS, OS version, C compiler version? Anything else >> > that you might think is needed to reproduce this? >> > >> > G. >> > >> > >> > On Wed, Dec 5, 2012 at 3:44 PM, Charles Novaes de Santana >> > <[email protected]> wrote: >> >> >> >> Just to explay why I think my problem with the "infinity" values: >> >> >> >> Because I tryied to debug my program and I got the following message: >> >> >> >> Program received signal SIGSEGV, Segmentation fault. >> >> igraph_vector_fill (v=0xbffff6ac, e=inf) at vector.pmt:682 >> >> 682 *ptr = e; >> >> >> >> As the value received by function igraph_vector_fill is "e=inf" I >> >> suppose it was my problem. >> >> >> >> Best, >> >> >> >> Charles >> >> >> >> On Wed, Dec 5, 2012 at 9:40 PM, Charles Novaes de Santana >> >> <[email protected]> wrote: >> >> > Thank you again, Tamás. You were absolutely right about my mistake in >> >> > printing the matrix. I did a simple cast and my matrix operations >> >> > worked fine. >> >> > >> >> > But I still have problems with the "infinity" given by the >> >> > shortest_paths function. I did the function you suggested me (to >> >> > replace all IGRAPH_INFINITY by zeros), but I have problems in the >> >> > calculation of the shortest paths itself, before I have the >> >> > opportunity to replace the "inifinity" by "zero". >> >> > >> >> > If you don't mind, I am sending attached to this message a small >> >> > program with the part of my code where I got the error. And an >> >> > example >> >> > of a network I am studying. Maybe it is an error in the format of my >> >> > network and I can not understand it yet. Or maybe it is because my >> >> > network is very sparse. >> >> > >> >> > Thank you very much for your attention, >> >> > >> >> > Best, >> >> > >> >> > Charles >> >> > >> >> > /*SOURCE CODE*/ >> >> > >> >> > #include<igraph.h> >> >> > >> >> > int main(void){ >> >> > igraph_t g1; >> >> > igraph_matrix_t l1; >> >> > igraph_vs_t vertices; >> >> > >> >> > int i,j; >> >> > FILE *ifile1; >> >> > >> >> > /*Reading the network*/ >> >> > ifile1=fopen("./network.net", "r"); >> >> > if (ifile1==0) {return 10;} >> >> > igraph_read_graph_pajek(&g1, ifile1); >> >> > fclose(ifile1); >> >> > >> >> > /*Initializing the matrix l1 and the vector of vertices*/ >> >> > >> >> > igraph_vs_all(&vertices); >> >> > igraph_matrix_init(&l1, 0, 0); >> >> > >> >> > /*Calculating the shortest paths*/ >> >> > >> >> > igraph_shortest_paths(&g1,&l1,vertices,vertices,IGRAPH_ALL); >> >> > >> >> > /*Desconstructors*/ >> >> > igraph_matrix_destroy(&l1); >> >> > igraph_vs_destroy(&vertices); >> >> > igraph_destroy(&g1); >> >> > return; >> >> > } >> >> > >> >> > >> >> > igraph_matrix_destroy(&l1); >> >> > igraph_vs_destroy(&vertices); >> >> > igraph_destroy(&g1); >> >> > >> >> > >> >> > On Wed, Dec 5, 2012 at 10:32 AM, Tamás Nepusz <[email protected]> >> >> > wrote: >> >> >>> First, I was wondering if Igraph considers IGRAPH_INFINITY as zero >> >> >>> or >> >> >>> as other value. >> >> >> IGRAPH_INFINITY is infinity, period. It is there only to provide us >> >> >> with a sort-of-platform-independent way to refer to infinity. >> >> >> >> >> >>> I am working with shortest-paths matrices and I would >> >> >>> like the distance between two vertices that can not reach each >> >> >>> other >> >> >>> to be zero. >> >> >> Well, you have to check all the cells in the matrix and if a cell is >> >> >> equal to IGRAPH_INFINITY, you have to set it to zero. >> >> >> >> >> >>> (I tryied to do "igraph_matrix_scale(matrix,1./2)" and it gave >> >> >>> me a zero-matrix). >> >> >> Theoretically it should work; there is no limitation on >> >> >> igraph_matrix_scale to work on integer values only. I have just >> >> >> tested it on >> >> >> my machine and it worked for me, so I guess that the error is >> >> >> somewhere >> >> >> else; for instance, in the way you print the values. >> >> >> >> >> >> Cheers, >> >> >> -- >> >> >> T. >> >> >> >> >> >> >> >> >> _______________________________________________ >> >> >> igraph-help mailing list >> >> >> [email protected] >> >> >> 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 >> >> >> >> >> >> >> >> -- >> >> 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 >> >> >> >> _______________________________________________ >> >> igraph-help mailing list >> >> [email protected] >> >> https://lists.nongnu.org/mailman/listinfo/igraph-help >> > >> > >> > >> > >> > -- >> > Gabor Csardi <[email protected]> MTA KFKI RMKI >> > >> > >> > _______________________________________________ >> > igraph-help mailing list >> > [email protected] >> > 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 >> >> _______________________________________________ >> igraph-help mailing list >> [email protected] >> https://lists.nongnu.org/mailman/listinfo/igraph-help > > > > > -- > Gabor Csardi <[email protected]> MTA KFKI RMKI > > > _______________________________________________ > igraph-help mailing list > [email protected] > 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 _______________________________________________ igraph-help mailing list [email protected] https://lists.nongnu.org/mailman/listinfo/igraph-help
