2441 search results for "GIS"

Heartbeat of a Cycling City: Bixi data at Hack/Reduce

May 8, 2012
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Heartbeat of a Cycling City: Bixi data at Hack/Reduce

The recent Hack/Reduce hackathon in Montreal was a tonne of fun. Our team tackled a data set of consisting of Bixi (Montreal’s bicycle share system) station states at one minute temporal resolution. We used Hadoop and mapreduce to pull out some features of user behaviours. One of the things we extracted was the flux at

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useR! 2012 – DEADLINE FAST APPROACHING!

May 7, 2012
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useR! 2012 – DEADLINE FAST APPROACHING!

DEADLINE FAST APPROACHING – 8th Annual International R User Conference useR! 2012, Nashville, Tennessee USA Registration Deadlines: Early Registration: Passed Regular Registration: Mar 1- May 12 Late Registration: May 13 – June 4 On-Site Registration: June 12 – June 15 Please note: Nashville is offering several large entertainment events the month of June, and hotels are quickly selling out....

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Bivariate linear mixed models using ASReml-R with multiple cores

May 7, 2012
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Bivariate linear mixed models using ASReml-R with multiple cores

A while ago I wanted to run a quantitative genetic analysis where the performance of genotypes in each site was considered as a different trait. If you think about it, with 70 sites and thousands of genotypes one is trying … Continue reading →

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PubMed publications in 2011 by 202 world countries: who’s the winner?

May 7, 2012
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PubMed publications in 2011 by 202 world countries: who’s the winner?

Which country had the most PubMed citations in 2011? To find out I used R statistical software to analyze the affiliation of 986 427 articles.

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Making an Animated Heart GIF in R

May 5, 2012
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Messing around with animations, I created this toy example to make a growing outline of a heart in R. I have put it up as a gist on GitHub and embedded it below. It uses the animation and the ggplot2 packages--both of which make it incredibly simple to...

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Getting R2WinBUGS to talk to WinBUGS 1.4 on Ubuntu 12.04 LTS

May 4, 2012
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Disclaimer 1: WinBUGS is old and not maintained. There are other packages to use, if you would like to take advantage of more modern developments in MCMC such as: PyMC which transparently implements adaptive Metropolis-Hastings proposals (among other great features), or the LaplacesDemon R package, which … Continue reading →

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Ack! Duplicates in the Data!

May 3, 2012
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Ack!  Duplicates in the Data!

As I mentioned in a previous post, I compiled the data set that I’m currently working on in PostgreSQL.  To get this massive data set, I had to write a query that was massive by dint of the number of … Continue reading →

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RegEx: Named Capture in R

May 3, 2012
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I consider myself a decent RegEx user.  References to famous quotes about RegEx aside, I find it intuitive, like its speed and that it makes my code simple (more so than the alternative anyhow). Thus, I use RegEx where I can in the growing grab bag of languages I consider myself proficient in: *nix command line / shell scripts Javascript PHP Matlab Python R Now...

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How to plot three categorical variables and one continuous variable using ggplot2

May 3, 2012
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How to plot three categorical variables and one continuous variable using ggplot2

This post shows how to produce a plot involving three categorical variables and one continuous variable using ggplot2 in R. The following code is also available as a gist on github. 1. Create Data First, let's load ggplot2 and create some data to work...

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EU rules that computer languages cannot be copyrighted

May 2, 2012
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EU rules that computer languages cannot be copyrighted

The European Court of Justice has published its decision in SAS v WPL; the title of the press release says it all “The functionality of a computer program and the programming language cannot be protected by copyright”. To summarise the background, World Programming Ltd developed a system that was capable of emulating the input/output behavior

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