Example #1
0
// Loads a (directed, undirected or multi) graph from a text file InFNm with 1 node and all its edges in a single line.
void IOConnList() {
  
  const int NNodes = 500;
  const int NEdges = 2000;
  
  const char *FName = "demo.graph.dat";
  
  PNEGraph GOut, GIn;
  GOut = GenRndGnm<PNEGraph>(NNodes, NEdges);
  
  // Create graph file
  FILE *F = fopen(FName, "w");
  for (TNEGraph::TNodeI NI = GOut->BegNI(); NI < GOut->EndNI(); NI++) {
    fprintf(F, "%d", NI.GetId());
    for (int i = 0; i < NI.GetOutDeg(); i++) {
      fprintf(F, " %d", NI.GetOutNId(i));
    }
    fprintf(F, "\n");
  }
  fclose(F);
  
  // Load edge list
  GIn = LoadConnList<PNEGraph>(FName);
  
  PrintGStats("ConnList - Out", GOut);
  PrintGStats("ConnList - In", GIn);
}
Example #2
0
// Save and load directed, undirected and multi-graphs, where node names are strings
void IOEdgeListStr() {
  
  const int NNodes = 1000;
  const int NEdges = 5000;
  
  const char *FName = "demo.graph.dat";
  
  PNEGraph GOut, GIn;      // Can also be PUNGraph or PNGraph
  GOut = GenRndGnm<PNEGraph>(NNodes, NEdges);
  
  // Output nodes as random strings
  TIntStrH OutNIdStrH;
  TStrHash<TInt> OutStrNIdH;
  
  // Generate unique random strings for graph
  TStr RandStr;
  for (TNEGraph::TNodeI NI = GOut->BegNI(); NI < GOut->EndNI(); NI++) {
    do {
      RandStr.Clr();
      TInt RandLen = TInt::Rnd.GetUniDevInt(5, 30);
      for (int i = 0; i < RandLen; i++) {
        TStr RandChar(TInt::Rnd.GetUniDevInt(33, 126));
        RandStr += RandChar;
      }
    }
    while (OutStrNIdH.IsKey(RandStr) || RandStr[0] == '#'); // Not unique or starts with comment
    OutNIdStrH.AddDat(NI.GetId(), RandStr);
    OutStrNIdH.AddDat(RandStr, NI.GetId());
  }
  
  // Create graph file
  FILE *F = fopen(FName, "w");
  for (TNEGraph::TEdgeI EI = GOut->BegEI(); EI < GOut->EndEI(); EI++) {
    TInt Src = EI.GetSrcNId();
    TInt Dst = EI.GetDstNId();
    fprintf(F, "%s %s\n", OutNIdStrH[Src].CStr(), OutNIdStrH[Dst].CStr());
  }
  fclose(F);
  
  // Load edge list of strings
  TStrHash<TInt> InStrToNIdH;
  GIn = LoadEdgeListStr<PNEGraph>(FName, 0, 1, InStrToNIdH);
  
  PrintGStats<PNEGraph>("EdgeListStr - Out", GOut);
  PrintGStats<PNEGraph>("EdgeListStr - In", GIn);

}