adjacency-list

I have the following schema for the tags table: CREATE TABLE tags ( id integer NOT NULL, name character varying(255) NOT NULL, parent_id integer ); I need to build a query to return the following structure (here represented as yaml for readability): - name: Ciencia parent_id: id: 7 children: - name: Química parent_id: 7 id: 9 children: [] - name: Biología parent_id: 7 id: 8 children: - name: Botánica parent_id: 8 id: 19 children: [] - name: Etología parent_id: 8 id: 18 children: [] After some trial and error and looking for similar questions in SO, I've came up with this query: WITH RECURSIVE

I want to create this Markov Chain in C#. I need to know if there is any other structure other than adjacency list which can work better in this situation. Also how can I use the existing .Net collection type to implement this. QuickGraph is really good general purpose graph library. It has some implementations for walking Markov Chains. I recommend checking out the source code. 来源： https://stackoverflow.com/questions/2781907/how-to-generate-markov-chain-in-c-sharp

I have a DB like so: id text parent 1 Parent 1 0 2 Child of 1 1 3 Sibling 1 4 Another Parent 0 5 A first child 4 So I'm trying to capture a tree structure my listing the parents. I'm aware of the other option (nested sets I think?) but I'm going to stick with this for now. I'm now trying to get the data out of the DB and into a nested array structure in PHP. I have a function like this: class Data_Manager { public $connection = ''; public $collection = array(); function __construct() { $this->connection = mysql_connect('localhost', 'root', 'root'); $thisTable = mysql_select_db('data'); //

I have two structs containing some fields: struct MyNodeData, and struct MyEdgeData. When I create a graph with VertexList as vecS, there is no problem to access the descriptor of vertices etc. For example: typedef adjacency_list<setS, vecS, undirectedS, MyNodeData, MyEdgeData> Graph; typedef Graph::vertex_descriptor MyNodeDataID; typedef Graph::edge_descriptor MyEdgeDataID; typedef graph_traits < Graph >::vertex_iterator VertexIterator; typedef graph_traits < Graph >::edge_iterator EdgeIterator; typedef graph_traits < Graph >::adjacency_iterator AdjacencyIterator; typedef property_map < Graph

My issue is that I want to display data in a hierarchal structure as so: Democrat County Clerk Candidate 1 Candidate 2 Magistrate Candidate 1 Candidate 2 Candidate 3 But I'm retrieving the dataset like this: Party | Office | Candidate -------------------------------------------- Democrat | County Clerk | Candidate 1 Democrat | County Clerk | Candidate 2 Democrat | Magistrate | Candidate 1 Democrat | Magistrate | Candidate 2 Democrat | Magistrate | Candidate 3 I planned on using nested repeaters, but I need a distinct value of Party, and then distinct values of office name within that party in

#include<iostream> using namespace std; class TCSGraph{ public: void addVertex(int vertex); void display(); TCSGraph(){ head = NULL; } ~TCSGraph(); private: struct ListNode { string name; struct ListNode *next; }; ListNode *head; } void TCSGraph::addVertex(int vertex){ ListNode *newNode; ListNode *nodePtr; string vName; for(int i = 0; i < vertex ; i++ ){ cout << "what is the name of the vertex"<< endl; cin >> vName; newNode = new ListNode; newNode->name = vName; if (!head) head = newNode; else nodePtr = head; while(nodePtr->next) nodePtr = nodePtr->next; nodePtr->next = newNode; } } void