Monthly Archives: August 2011

Le Monde puzzle [#737 re-read]

August 27, 2011
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Le Monde puzzle [#737 re-read]

As a coincidence, while I was waiting for the solution to puzzle #737 published this Friday in Le Monde, the delivery (wo)man forgot to include the weekend magazine and I had to buy it this morning with my baguette (as if anyone cares!). The solution is (y0,z0,w0)=(38,40,46) and…it does not work! The value of (x1,y1,z1,w1) is

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How Much of R is Written in R?

August 26, 2011
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How Much of R is Written in R?

My boss sent me an email (on my day off!) asking me just how much of R is written in the R language.  This is very simple if you use R and a Unix-like system.  It also gives me a good excuse to defend the title of this blog.  It’s librestats, not projecteulerstats, afterall. So

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25+ more ways to bring data into R

August 26, 2011
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25+ more ways to bring data into R

The rdatamarket post on the Revolutions blog and this post on Decision Stats reminded me about my list of Data APIs/feeds available as packages in R on Cross-Validated (which is a great site that you all should use).  Many of these packa...

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Revolution R: 100% R and More – slides and replay

August 26, 2011
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If you missed this week's webinar, the slides from my presentation Revolution R Enteprise: 100% R and More may be useful as an introduction to R and the additional capabilities of Revolution R Enterprise. The slides themselves and the replay video are also available for download from the link below. Revolution Analytics webinars: Revolution R Enterprise: 100% R and...

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9 more ways to bring data into R

August 26, 2011
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Here's a followup to yesterday's post on using the rdatamarket package to import data into R. Ajay Ohri at the DecisionStats blog offers nine additional methods for bringing data into R, from sources including InfoChimps, the Google Prediction API, the World Bank World Development Indicators, Bloomberg Market Data, and much more. See Ajay's post at the link below for...

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Because it’s Friday: Spurious correlation edition

August 26, 2011
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Because it’s Friday: Spurious correlation edition

If the Flight of the Concords taught me anything, it's that you can't trust Australians. This morning I was poking around the DataMarket site, when I noticed something suspicious about Australian sheep production: I decided to investigate further: ju...

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FishBASE from R

August 26, 2011
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FishBASE from R

In lab known for its quality data collection, high-speed video style, writing the weekly blog post can be a bit of a challenge for the local code monkey. That’s right, no videos today. But lucky for me, even this group … Continue reading →

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Fourier-Motzkin elimination with the editrules package

August 26, 2011
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Last week I talked about our editrules package at the useR!2011 conference. In the coming time I plan to write a short series of blogs about the functionality of editrules. Below I describe the eliminate and isFeasible functions. But first: … Continue reading →

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Fourier-Motzkin elimination with the editrules package

August 26, 2011
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Fourier-Motzkin elimination with the editrules package

Last week I talked about our editrules package at the useR!2011 conference. In the coming time I plan to write a short series of blogs about the functionality of editrules. Below I describe the eliminate and isFeasible functions. But first: a bit ...

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A first go at ‘manipulate’ in RStudio

August 26, 2011
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A first go at ‘manipulate’ in RStudio

Something I’m missing from R (especially coming from Mathematica) is the ability to quickly build interactive graphs, which I find very useful for getting a good intuition of the impact of parameters on a mathematical function. Richie Cotton’s post about … Continue reading →

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