Michael Ernst CSE 140 University of Washington

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Presentation transcript:

Michael Ernst CSE 140 University of Washington Graphs Michael Ernst CSE 140 University of Washington

A graph contains nodes and edges Example: auto part compatibility TODO: Add picture of graph of auto part compatibility

+ 350 students in no romantic and/or sexual relationship From: “Chains of Affection: The Structure of Adolescent Romantic and Sexual Networks”, American Journal of Sociology, by Peter Bearman of (Columbia), James Moody (Ohio State), and Katherine Stovel (U. of Washngton);

Graphs A graph can be thought of as either of: a collection of edges Each edge represents some relationship for each node, a collection of neighbors The neighbors are those connected by an edge

Operations on a graph Creation: Create an empty graph Querying: Look up a node: Does it exist? What are its neighbors? Look up an edge (= a pair of nodes): does it exist? (You know the nodes it connects.) Iterate through the nodes or edges Modification: Add/remove a node Add/remove an edge