Lecture 2 – Searching. Lecture outline Last week Introduced AI and the module Brief recap of data structures This week Introduction to searching methods.

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Lecture 2 – Searching.

Presentation transcript:

Lecture 2 – Searching

Lecture outline Last week Introduced AI and the module Brief recap of data structures This week Introduction to searching methods A* algorithm Pathfinding

Why search? Finding a path from a starting point to an end point.

Depth-First Search Taken from Jones (2005)

Breadth-First Search Taken from Jones (2005)

Which is best? Breadth-first Search? Depth-first Search?

A Star Similar to DFS and BFS Measures of the cost of the nodes DFS and BFS search blindly – The work ‘blindly’ relying a the approach to get the answer. A* is a Heuristic search it use a measure to direct the follow the system.

A Star Three parameters HDistance of node from goal node GCost of moving from the parent node to the new node. F=H+G

A Star/A*

For each adjacent node

Next Week Evolutionary algorithms-These have searching at their core. What were the key points of today? Summarise them as 5 points.

References Jones MT(2005) AI Application Programming 2 nd Edition ISBN