2443 search results for "gis"

Webinar: Revolution R is 100% R and More

December 7, 2010
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I'll be hosting a webinar tomorrow (Wednesday) aimed at R users who want to know more about how Revolution R Enterprise extends open source R for big data, Web services, multi-core processing, debugging and more. For R users at schools and universities, I'll also explain how you can download and use Revolution R Enterprise free of charge. The full...

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Forecasting workshop: Switzerland, June 2011

December 6, 2010
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Forecasting workshop: Switzerland, June 2011

I will be running a workshop on Statistical Forecasting: Principles and Practice in Switzerland, 20-22 June 2011. Check out the venue: Waldhotel Doldenhorn, Kandersteg! So if you fancy a trip to the beautiful Swiss Alps next June, read on… Outline Forecasting is required in many situations: deciding whether to build another power generation plant in

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Another boring blog

December 2, 2010
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Another boring blog

I recently decided to create two blogs as outlets for my research.  The first (The Richness of Life) focuses more on the organisms I work with as an ecologist and my general interest as a student of natural history.  This blog on Quantitative...

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Random variable generation (Pt 2 of 3)

December 2, 2010
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Random variable generation (Pt 2 of 3)

Acceptance-rejection methods This post is based on chapter 1.4 of Advanced Markov Chain Monte Carlo. Another method of generating random variates from distributions is to use acceptance-rejection methods. Basically to generate a random number from , we generate a RN from an envelope distribution , where .  The acceptance-rejection algorithm is as follows: Repeat until

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Top 10 things that suck about Sweave

December 1, 2010
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Top 10 things that suck about Sweave

People rave about Sweave and the literate programing paradigm and I am guilty as charged. I speak Sweave, I think Sweave, I dream Sweave. As a matter of fact my default mode of operation is Sweave and anything else is an … Continue reading →

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Controlling Amazon Web Services using rJava and the AWS Java SDK

November 30, 2010
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Controlling Amazon Web Services using rJava and the AWS Java SDK

I’ve been messing around with using Amazon Web Services for a while. I’ve had some projects where I wanted to upload files to S3 or fire off EMR jobs. I’ve been controlling AWS services using a hodgepodge of command line tools and the R system() function to call the tools from the command line.

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Getting Started with Git, EGit, Eclipse, and GitHub: Version Control for R Projects

November 28, 2010
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This post provides information on (a) installing Git using the Eclipse plugin Egit. (b) uploading repositories to GitHub, and (c) links to resources on Git, Git and LaTeX, and Git and R. The focus is on version control for people working on R, Sweave, ...

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Getting Started with Git, EGit, Eclipse, and GitHub: Version Control for R Projects

November 28, 2010
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This post provides information on (a) installing Git using the Eclipse plugin Egit. (b) uploading repositories to GitHub, and (c) links to resources on Git, Git and LaTeX, and Git and R. The focus is on version control for people working on R, Sweave, ...

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Random variable generation (Pt 1 of 3)

November 28, 2010
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Random variable generation (Pt 1 of 3)

As I mentioned in a recent post, I’ve just received a copy of Advanced Markov Chain Monte Carlo Methods. Chapter 1.4 in the book (very quickly) covers random variable generation. Inverse CDF Method A standard algorithm for generating random numbers is the inverse cdf method. The continuous version of the algorithm is as follows: 1.

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Computational efficiency of great-circle distance calculations in R

November 28, 2010
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Computational efficiency of great-circle distance calculations in R

An obvious omission in my previous post on Great-circle distance calculations in R was a lack of discussion on the computational efficiency of the various methods, and in particular comparing different implementations of the same method. One of the comments … Continue reading →

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