2615 search results for "gis"

Create an animated clock in R with ggplot2 (and ffmpeg)

August 12, 2011
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Because it’s Friday—and I needed to create this for a separate visualization—here is how to create an animated clock in R using ggplot2. In just about 20 lines of code! And here is the clock… I think this is a nifty way to show time elapse, rather than the windowed timelines I had used previously.

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Revolution Newsletter: August 2011

August 12, 2011
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The most recent edition of the Revolution Newsletter is out. The news section is below, and you read the full August edition (with highlights from this blog and community events) online. You can subscribe to the Revolution Newsletter to get it monthly via email. Free 30-minute introduction to Revolution R Enterprise. On Wednesday August 24, author and blogger David...

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Musings on Correlation (or yet another reason I fear for those non-methodologically inclined students in my cohort)

August 12, 2011
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Musings on Correlation (or yet another reason I fear for those non-methodologically inclined students in my cohort)

I’ve been thinking a lot about what it means for two variables to be correlated.  Scientists throw around the term like it’s uniformly understood, but I fear that an understanding of the concept is elusive to substantive researchers who aren’t interested in empirical methods, except as a means by which we can demonstrate that our

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High-Performance in Cloud Computing

August 11, 2011
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High-Performance in Cloud Computing

Very often scientists are worried about performance and security in cloud computing. Especially, when talking about High-Performance Computing (HPC) in the cloud it is a very important aspect to proof efficient calculation speed in the cloud. Cloud computing describes a new delivery model for IT services based on Internet protocols, and it typically involves provisioning

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ggplot2: Determining the order in which lines are drawn

August 11, 2011
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ggplot2: Determining the order in which lines are drawn

In a time series, I want to plot the values of an interesting cluster versus the background. However, if I'm not careful, ggplot will draw the items in an order determined by their name, so background items will obscure the interesting cluster: Corr...

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Climate datasets in R

August 10, 2011
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As an ecologist working on climate change questions, I’ve always found it rather tedious to acquire and process climate data, especially when dealing with large spatiotemporal scales. Although many agencies provide free access to climate data, there is often some overhead (typically one to two days) before the data are made available for download via

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In case you missed it: July Roundup

August 10, 2011
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In case you missed them, here are some articles from July of particular interest to R users. A simulation in R finds the value (or disadvantage) or drawing an X, J, Q or Z in Scrabble. How to display high-quality graphics on the web using SVG output from R. A review of Paul Murrell's talk about raster image support...

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Using the google prediction API from R

August 10, 2011
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Using the google prediction API from R

Google has a "black box" prediction API that they provide for use with creating recommender systems or filtering spam. Furthermore, they provide an R package for interfacing that API, but try as I might I cannot get it to work under windows. Here are ...

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Plotting molecular properties for (sub)sets

August 10, 2011
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Plotting molecular properties for (sub)sets

For a toxicology paper we are writing up, I need to create a few plots showing how the toxic and non-toxic molecules differ (or not) with respect to a few molecular properties, such as logP or the molecular weight. The rcdk package provides all, of cou...

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Scraping web data in R

August 10, 2011
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Scraping web data in R

In my last post, I went through a lot of effort to scrape the PMI index off the ISM website.  It turns out that was unnecessary effort, as commentator "senne" pointed out that this index is available from FRED, with the symbol NAPM. &nbs...

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