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Neo4j: Making implicit relationships explicit & bidirectional relationships

I recently read Michal Bachman’s post about bidirectional relationships in Neo4j in which he suggests that for some relationship types we’re not that interested in the relationship’s ...
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Neo4j: Exploring new data sets with help from Neo4j browser

One of the things that I’ve found difficult when looking at a new Neo4j database is working out the structure of the data it contains. I’m used to relational databases where you ...
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Java: Incrementally read/stream a CSV file

I’ve been doing some work which involves reading in CSV files, for which I’ve been using OpenCSV, and my initial approach was to read through the file line by line, parse the contents ...
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Elo Rating System: Ranking Champions League teams using Clojure

As I mentioned in an earlier blog post I’ve been learning about ranking systems and one of the first ones I came across was the Elo rating system which is most famously used to rank ...
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Clojure: All things regex

I’ve been doing some scrapping of web pages recently using Clojure and Enlive and as part of that I’ve had to write regular expressions to extract the data I’m interested in. On ...
java-interview-questions-answers

Jersey Client: Testing external calls

  Jim and I have been doing a bit of work over the last week which involved calling neo4j’s HA status URI to check whether or not an instance was a master/slave and we’ve been ...
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neo4j/cypher: Getting the hang of query parameters

For as long as I’ve been using neo4j‘s cypher query language Michael has been telling me to use parameters in my queries but the performance of the queries was always acceptable ...
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Graph Processing: Betweeness Centrality – neo4j’s cypher vs graphstream

Last week I wrote about the betweenness centrality algorithm and my attempts to understand it using graphstream and while reading the source I realised that I might be able to put something ...
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Survivorship Bias and Product Development

A couple of months ago I came across an interesting article by the author of ‘You Are Not So Smart‘ about a fallacy known as ‘Survivorship Bias‘ which Wikipedia defines as: The ...
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No downtime deploy with capistrano, Thin and nginx

As I mentioned a couple of weeks ago I’ve been working on a tutorial about thinking through problems in graphs and since it’s a Sinatra application I thought thin would be a decent ...
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