boost-react-native-bundle

<html>  <head> <title>Boost Graph Library: random</title> <body BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b" ALINK="#ff0000"> <IMG SRC="../../../boost.png" ALT="C++ Boost" width="277" height="86"> <br> The header <tt><boost/graph/random></tt> provides routines to create random graph, select random vertices and edges, and randomize properties. <h1>Synopsis</h1> <pre> template <class Graph, class RandomNumGen> typename graph_traits<Graph>::vertex_descriptor random_vertex(Graph& g, RandomNumGen& gen); template <class Graph, class RandomNumGen> typename graph_traits<Graph>::edge_descriptor random_edge(Graph& g, RandomNumGen& gen); template <typename MutableGraph, class RandNumGen> void generate_random_graph (MutableGraph& g, typename graph_traits<MutableGraph>::vertices_size_type V, typename graph_traits<MutableGraph>::vertices_size_type E, RandNumGen& gen, bool self_edges = false); template<class Property, class G, class RandomGenerator> void randomize_property(G& g, RandomGenerator rg); </pre> <h1>Description</h1> <h2 id="random_vertex">random_vertex</h2> <pre> template <class Graph, class RandomNumGen> typename graph_traits<Graph>::vertex_descriptor random_vertex(Graph& g, RandomNumGen& gen); </pre> <p><b>Effects:</b> Selects a random vertex in a graph and returns it. <p><b>Preconditions:</b> <tt>num_vertices(g) != 0</tt> <p><b>Complexity:</b> <tt>O(num_vertices(g))</tt> <h2 id="random_edge">random_edge</h2> <pre> template <class Graph, class RandomNumGen> typename graph_traits<Graph>::edge_descriptor random_edge(Graph& g, RandomNumGen& gen); </pre> <p><b>Effects:</b> Selects a random edge in a graph and returns it. <p><b>Preconditions:</b> <tt>num_edges(g) != 0</tt> <p><b>Complexity:</b> <tt>O(num_edges(g))</tt> <h2 id="generate_random_graph">generate_random_graph</h2> <pre> template <typename MutableGraph, class RandNumGen> void generate_random_graph (MutableGraph& g, typename graph_traits<MutableGraph>::vertices_size_type V, typename graph_traits<MutableGraph>::vertices_size_type E, RandNumGen& gen, bool allow_parallel = true, bool self_edges = false); </pre> <p><b>Effects:</b> Adds <tt>V</tt> vertices and <tt>E</tt> edges, to <tt>g</tt>. Source and target vertices of each edge are randomly choosen. If <tt>self_edges</tt> is false, then no edge will have the same source and targets. <p><b>Precondition:</b> <tt>num_vertices(g) == 0</tt> <p><b>Compleixity:</b> <tt>O(V*E)</tt> <h2 id="randomize_property">randomize_property</h2> <pre> template<class Property, class G, class RandomGenerator> void randomize_property(G& g, RandomGenerator& rg); </pre> <p><b>Effects:</b> Sets the random value of property on either all vertices, or all edges, depending on property kind. <p><b>Complexity:</b> <tt>O(V)</tt> or <tt>O(E)</tt>, depending on property kind. <hr> <p class="revision">Last modified: Feb 05, 2003</p> <p>© Copyright Vladimir Prus 2003. Permission to copy, use, modify, sell and distribute this document is granted provided this copyright notice appears in all copies. This document is provided ``as is'' without express or implied warranty, and with no claim as to its suitability for any purpose.</p> </body> </html>