February 2017
Intermediate to advanced
274 pages
5h 58m
English
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Using Breadth-First Search
The Breadth-first search (BFS) is a new algorithm as part of GraphFrames that finds the shortest path from one set of vertices to another. In this section, we will use BFS to traverse our tripGraph to quickly find the desired vertices (that is, airports) and edges (that is, flights). Let's try to find the shortest number of connections between cities based on the dataset. Note that these examples do not consider time or distance, just hops between cities. For example, to find the number of direct flights between Seattle and San Francisco, you can run the following query:
# Obtain list of direct flights between SEA and SFO filteredPaths = tripGraph.bfs( fromExpr = "id = 'SEA'", toExpr = "id = 'SFO'", maxPathLength = 1) ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.