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Which Is Closer: Local Beer or Local Whiskey?
For which fraction of the US is the nearest brewery further away than the nearest distillery? Analysis and visualization done with Wolfram Language.
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Querying Time Series in PostgreSQL
A blog about computer programs, databases, and the future of software development.
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The R language, for programmers
Some things about the R programming language that programmers coming from other languages are likely to trip over.
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Hermitage: Testing the “I” in ACID
tl;dr: I have created a test suite for comparing the transaction isolation levels in different databases. I did this as background research for my book . This post explains why.
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Let’s Make a Bubble Map
My previous Let’s Make a Map tutorial describes how to make a basic map with D3 and TopoJSON ; now it’s time to cover thematic mapping in the form of a proportional symbol map. The simplest symbol is a circle, or bubble , whose area is proportional to the associated data. In this tutorial, we’ll make a bubble map of…
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Stranger in a Strange Land: “Big Data” programmer meets HPC community
I attended the SIAM PP 2014 conference this week, because I'm developing an interest in MPI-style parallel algorithms (also, it was close b...
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PredictionIO – open source machine learning for predictive features
PredictionIO is an open source machine learning server for software developers to create predictive features, such as personalization, recommendation and content discovery. Building a production-grade engine to predict users’ preferences ...
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Roshi: a CRDT system for timestamped events
Let’s talk about the stream. The SoundCloud stream represents stuff that’s relevant to you primarily via your social graph, arranged in time order, newest-first. The atom of that data model, an event, is a simple enough thing. Timestamp User who did the thing Identifier of the thing that was done For example, At…
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WebScaleSQL: A collaboration to build upon the MySQL upstream
Visit the post for more.
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Principles of good data analysis
Good, thorough data analysis is difficult. Throughout my work, I've found it useful to follow these principles in order to ensure quality and consistency.
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I Love Julia
For the past half year I’ve been exploring Julia in piecemeal fashion. It’s a language that does not conform to the traditional notions of programming. Julia...
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Perceptual Image Hashing
Joe Bertolami's portfolio and blog covering artificial intelligence, game development, computer graphics, data compression, and more.
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Web SQL Database: In Memoriam
All signs seem to indicate that Apple will finally ship IndexedDB in Safari 7.1 sometime this year. This means that Safari, the last holdout against IndexedDB,…
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Pyleus: An Open-source Framework for Building Storm Topologies in Pure Python
Introducing Pyleus: An Open-source Framework for Building Storm Topologies in Pure Python Patrick L., Software Engineer Oct 15, 2014 Yelp loves Python, and we use it at scale to power...
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Multidimensional analysis of plot arcs in thousands of TV and movie scripts
Note: a somewhat more complete and slightly less colloquial, but eminently more citeable, version of this work is in the Proceedings of the ...
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Fixing Bad Data in Datomic
The free database designed for immutable values and a time-aware information model.
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Analysis of 419,000 FlapMMO attempts
FlapMMO is a new and popular browser game inspired by Flappy Bird. Unlike Flappy Bird, though, each server has hundreds of other players and you can all see each other. It's lots of fun and I previously posted about hacking FlapMMO for mouse control .
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ZooKeeper: Wait-free coordination for Internet-scale systems
Zookeeper is an Apache project for providing coordination services to distributed systems. ZooKeeper aims to provide a simple kernel (a fil...
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Call me maybe: MongoDB (2013)
Previously in Jepsen , we discussed Redis . In this post, we’ll see MongoDB drop a phenomenal amount of data. See also: followup analyses of 2.6.7 and 3.4.0-rc3 .
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Cdb: a fast, reliable, simple package for creating, reading constant databases
Packages that need to read cdb files should incorporate the necessary portions of the cdb library rather than relying on an external cdb library.