src/benchmark/graph-bench.cc
author deba
Thu, 19 May 2005 11:49:42 +0000
changeset 1429 4283998fb2be
parent 921 818510fa3d99
permissions -rw-r--r--
Able to read edge from undirected edgeset
Graph reader and graph writer can resolve items by id.

It makes possible:

GraphReader<Graph> reader(std::cin, graph);

reader.readNodeMap....

NewEdgeSetAdaptor<Graph> edgeset(graph);
UndirEdgeSetReader<Graph> unir_edgeset_reader(reader, edgeset, reader);

reader.run();

It reads the graph and an additional edgeset in to the edgeset.
     1 #include<lemon/list_graph.h>
     2 
     3 #include"bench_tools.h"
     4 
     5 using namespace lemon;
     6 
     7 ///Makes a full graph by adding and deleting a lot of edges;
     8 
     9 ///\param n Number of nodes.
    10 ///\param rat The funcion will make \f$rat\timesn^2\f$ edge addition and
    11 ///\f$(rat-1)\timesn^2\f$ deletion.
    12 ///\param p Tuning parameters.
    13 ///\warning \c rat, \c p, and \c n must be pairwise relative primes. 
    14 template <class Graph>
    15 void makeFullGraph(int n, int rat, int p)
    16 {
    17   GRAPH_TYPEDEF_FACTORY(Graph);
    18 
    19   Graph G;
    20   
    21   //  Node nodes[n];
    22   std::vector<Node> nodes(n);
    23   for(int i=0;i<n;i++) nodes[i]=G.addNode();
    24   
    25   //Edge equ[rat];
    26   std::vector<Edge> equ(rat);
    27   
    28   long long int count;
    29   
    30   for(count=0;count<rat;count++) {
    31     equ[count%rat]=G.addEdge(nodes[(count*p)%n],nodes[(count*p/n)%n]);
    32   }
    33   for(;(count%rat)||((count*p)%n)||((count*p/n)%n);count++) {
    34     //    if(!(count%1000000)) fprintf(stderr,"%d\r",count);
    35     if(count%rat) G.erase(equ[count%rat]);
    36     equ[count%rat]=G.addEdge(nodes[(count*p)%n],nodes[(count*p/n)%n]);
    37   }
    38 //   std::cout << "Added " << count
    39 // 	    << " ( " << n << "^2 * " << rat << " ) edges\n";
    40 
    41 
    42   //  for(int i=0;1;i++) ;
    43 }
    44 
    45 int main()
    46 {
    47   lemon::Timer T;
    48   makeFullGraph<ListGraph>(nextPrim(1000),nextPrim(300),nextPrim(100));
    49   
    50   PrintTime("BIG",T);
    51   T.reset();
    52   makeFullGraph<ListGraph>(nextPrim(100),nextPrim(30000),nextPrim(150));
    53 
    54   PrintTime("SMALL",T);
    55 }