# HG changeset patch
# User marci
# Date 1083864131 0
# Node ID 4cbfb435ec2b5ef8d9b337373f149562580191f1
# Parent  9c0ce0a1f00092eb4e71f87a2c6e7cb9dc385414
random graph, random bipartite graph in jacint/graph_gen.h

diff -r 9c0ce0a1f000 -r 4cbfb435ec2b src/work/jacint/graph_gen.h
--- a/src/work/jacint/graph_gen.h	Thu May 06 17:01:31 2004 +0000
+++ b/src/work/jacint/graph_gen.h	Thu May 06 17:22:11 2004 +0000
@@ -1,16 +1,7 @@
 // -*- c++ -*-
-//randomGraph(i,j) gives a random graph on i nodes and j edges.
 #include <vector>
 #include <cstdlib>
 
-//#include <list_graph.h>
-//#include <time_measure.h>
-//#include <for_each_macros.h>
-//#include <bfs_iterator.h>
-//#include <bipartite_graph_wrapper.h>
-//#include <maps.h>
-//#include <max_flow.h>
-
 namespace hugo {
 
 
@@ -38,15 +29,36 @@
   }
 
 
+  /// Generates a random graph with n nodes and m edges.
+  /// Before generating the random graph, \c g.clear() is called.
   template<typename Graph>
-  void randomGraph (Graph& g, int n, int m) {
-    typedef typename Graph::Node Node;
+  void randomGraph(Graph& g, int n, int m) {
     g.clear();
-    std::vector<Node> nodes;
+    std::vector<typename Graph::Node> nodes;
     for (int i=0; i<n; ++i)
       nodes.push_back(g.addNode());
     for (int i=0; i<m; ++i) 
       g.addEdge(nodes[random(n)], nodes[random(n)]);
   }
 
-}
+  /// Generates a random bipartite graph with a and b nodes 
+  /// in the color classes and m edges.
+  /// According to the bipartite graph concept, the resulting 
+  /// graph is directed from the first class to the second one.
+  /// Before generating the random graph, \c g.clear() is called.
+  template<typename Graph>
+  void randomBipartiteGraph(Graph& g, int a, int b, int m) {
+    g.clear();
+    std::vector<typename Graph::Node> s_nodes;
+    std::vector<typename Graph::Node> t_nodes;
+    for (int i=0; i<a; ++i)
+      ///\bug g.addNode(g.S_CLASS) would be better.
+      s_nodes.push_back(g.addNode(false));
+    for (int i=0; i<b; ++i)
+      ///\bug g.addNode(g.T_CLASS) would be better.
+      t_nodes.push_back(g.addNode(true));
+    for (int i=0; i<m; ++i) 
+      g.addEdge(s_nodes[random(a)], t_nodes[random(b)]);
+  }
+
+} //namespace hugo
diff -r 9c0ce0a1f000 -r 4cbfb435ec2b src/work/marci/bipartite_graph_wrapper.h
--- a/src/work/marci/bipartite_graph_wrapper.h	Thu May 06 17:01:31 2004 +0000
+++ b/src/work/marci/bipartite_graph_wrapper.h	Thu May 06 17:22:11 2004 +0000
@@ -247,8 +247,8 @@
     }
     
     void clear() {
-      FOR_EACH_LOC(typename Parent::EdgeIt, e, G) erase(e);
-      FOR_EACH_LOC(typename Parent::NodeIt, n, G) erase(n);
+      FOR_EACH_LOC(typename Parent::EdgeIt, e, *this) erase(e);
+      FOR_EACH_LOC(typename Parent::NodeIt, n, *this) erase(n);
     }
   };
 
diff -r 9c0ce0a1f000 -r 4cbfb435ec2b src/work/marci/bipartite_matching_try_3.cc
--- a/src/work/marci/bipartite_matching_try_3.cc	Thu May 06 17:01:31 2004 +0000
+++ b/src/work/marci/bipartite_matching_try_3.cc	Thu May 06 17:22:11 2004 +0000
@@ -2,7 +2,6 @@
 #include <iostream>
 #include <fstream>
 #include <vector>
-#include <cstdlib>
 
 #include <list_graph.h>
 //#include <smart_graph.h>
@@ -13,6 +12,7 @@
 #include <bipartite_graph_wrapper.h>
 #include <hugo/maps.h>
 #include <max_flow.h>
+#include <graph_gen.h>
 
 using namespace hugo;
 
@@ -79,27 +79,6 @@
   int matchingValue() { return mf.flowValue(); }
 };
 
-/**
- * Inicializalja a veletlenszamgeneratort.
- * Figyelem, ez nem jo igazi random szamokhoz,
- * erre ne bizzad a titkaidat!
- */
-void random_init()
-{
-	unsigned int seed = getpid();
-	seed |= seed << 15;
-	seed ^= time(0);
-
-	srand(seed);
-}
-
-/**
- * Egy veletlen int-et ad vissza 0 es m-1 kozott.
- */
-int random(int m)
-{
-  return int( double(m) * rand() / (RAND_MAX + 1.0) );
-}
 
 int main() {
   //typedef UndirListGraph Graph; 
@@ -113,9 +92,6 @@
 
   Graph g;
 
-  std::vector<Graph::Node> s_nodes;
-  std::vector<Graph::Node> t_nodes;
-
   int a;
   std::cout << "number of nodes in the first color class=";
   std::cin >> a; 
@@ -127,13 +103,8 @@
   std::cin >> m; 
   
   std::cout << "Generatig a random bipartite graph..." << std::endl;
-  for (int i=0; i<a; ++i) s_nodes.push_back(g.addNode(false));
-  for (int i=0; i<b; ++i) t_nodes.push_back(g.addNode(true));
-
   random_init();
-  for(int i=0; i<m; ++i) {
-    g.addEdge(s_nodes[random(a)], t_nodes[random(b)]);
-  }
+  randomBipartiteGraph(g, a, b, m);
 
 //   std::cout << "Edges of the bipartite graph:" << std::endl;
 //   FOR_EACH_LOC(EdgeIt, e, g) std::cout << e << " ";