Re: [igraph] Using basic querry commands for Igraph

[Gábor Csárdi]

Ketan,

igraph_integer_t is not necessarily 'int' (it is actually not), so if
you want to print it with printf you need to cast it:

printf("No. of vertex = %d \n", (int) nbVertex);

and the same for the number of edges.

Best,
G.

On Fri, May 22, 2009 at 2:22 PM, ketan bhardwaj <address@hidden> wrote:
> Hello Gabor,
>
> here is what i do ... DO, EXPECT and NOTEXPECT are just checking macros that
> i have defined . Thanks for the help !
>
> int main()
> {
>  igraph_t graph;
>  int res;
>  FILE * ipFile, *opFile;
>
>  igraph_vector_t edges;
>  igraph_integer_t nbVertex =0, nbEdges=0;
>
>
>  start_program("**** STARTING PROGRAM ...****\n");
>
>
>  DO("Open state_machine.txt and read_state_machine.txt...\n");
>  ipFile = fopen("state_machine.txt","r+");
>  NOT_EXPECT(ipFile,NULL);
>  opFile = fopen("read_state_machine.txt","w+");
>  NOT_EXPECT(ipFile,NULL);
>  if(ipFile == NULL || opFile == NULL)
>  goto END;
>
>  /* create and write the read graph from and to file*/
>  DO("Creating Graph from file state_machine.txt...\n");
>  res = igraph_read_graph_edgelist(&graph,ipFile,5,IGRAPH_DIRECTED);
>  EXPECT(res,IGRAPH_SUCCESS);
>
>  DO("Writing the read graph to read_state_machine.txt...\n");
>  res = igraph_write_graph_edgelist(&graph,opFile);
>  EXPECT(res,IGRAPH_SUCCESS);
>
>  DO("Getting No. of vertices ...\n");
>  nbVertex = igraph_vcount(&graph);
>  printf("No. of vertex = %d \n",nbVertex);
>  EXPECT(nbVertex,5);
>
>  DO("Getting No. of Edges ...\n");
>  nbEdges = igraph_ecount(&graph);
>  printf("No. of edges = %d\n",nbEdges);
>  EXPECT(nbEdges,12);
>
>  DO("Destroying the graph...\n");
>  res = igraph_destroy(&graph);
>  EXPECT(res,IGRAPH_SUCCESS);
>  //close open files
>  DO("Closing Files ... \n");
>  if(ipFile != NULL)
>  fclose(ipFile);
>  if(opFile !=NULL)
>  fclose(opFile);
>
>  DO("----------Done---------------\n");
> END:
>  return 1;
> }
>
> On Fri, May 22, 2009 at 5:48 PM, Gábor Csárdi <address@hidden> wrote:
>>
>> Ketan, this is hard to answer if you don't show us what you did exactly.
>>
>> Best,
>> Gabor
>>
>> On Fri, May 22, 2009 at 1:51 PM, ketan bhardwaj <address@hidden> wrote:
>> > Hello all,
>> >
>> > This is what i am doing :
>> > Create a graph using
>> > igraph_read_graph_edgelist()
>> >
>> > and counting the number of edges using igraph_ecount() but getting zero.
>> >
>> > here are the contents of file i am using
>> > 0 1 0 2 0 3 0 4 0 5 1 2 2 1 2 3 3 2 2 4 4 2 3 4 4 3
>> >
>> > Here are the contents of the file which i get from
>> > igraph_write_graph_edgelist()
>> >
>> > 0 1
>> >
>> > 0 2
>> >
>> > 0 3
>> >
>> > 0 4
>> >
>> > 0 5
>> >
>> > 1 2
>> >
>> > 2 1
>> >
>> > 2 3
>> >
>> > 2 4
>> >
>> > 3 2
>> >
>> > 3 4
>> >
>> > 4 2
>> >
>> > 4 3
>> > i think this is exactly right but why am i not be able to get the number
>> > of
>> > vertices.? any help.
>> >
>> > regards
>> > ketan
>> > --
>> > To get a comprehensive view of my work Please visit
>> > http://ketanbj.googlepages.com
>> >
>> > _______________________________________________
>> > igraph-help mailing list
>> > address@hidden
>> > http://lists.nongnu.org/mailman/listinfo/igraph-help
>> >
>> >
>>
>>
>>
>> --
>> Gabor Csardi <address@hidden>     UNIL DGM
>>
>>
>> _______________________________________________
>> igraph-help mailing list
>> address@hidden
>> http://lists.nongnu.org/mailman/listinfo/igraph-help
>
>
>
> --
> To get a comprehensive view of my work Please visit
> http://ketanbj.googlepages.com
>
> _______________________________________________
> igraph-help mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/igraph-help
>
>



-- 
Gabor Csardi <address@hidden>     UNIL DGM