2368 search results for "Map"

Taking R to the Limit: Parallelism and Big Data

August 23, 2010
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In a two-part series at the Los Angeles R User Group, Ryan Rosario took a look at the many ways you can take the R language to the limits of high-performance computing. In Part I (see video at this link; slides and code also available), Ryan focuses on the various methods of parallel computing in R. There's some great...

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Weekend art in R (Part 3)

August 21, 2010
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Weekend art in R (Part 3)

I have a few posts nearing completion, but meanwhile a weekend break for art. Big thanks to Simon Urbanek and Jeffrey Horner, creators of Cairo, a library for the programming language R. Have you noticed how R can’t anti-alias (fancy way for saying smooth out lines and curves when creating a bit-mapped image)? Cairo can.

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Taking R to the Limit, Part II – Large Datasets in R

August 20, 2010
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Taking R to the Limit, Part II – Large Datasets in R

For Part I, Parallelism in R, click here. Tuesday night I again had the opportunity to present on high performance computing in R, at the Los Angeles R Users’ Group. This was the second part of a two part series called “Taking R to the Limit: High Performance Computing in R.” Part II discussed ways to work with large datasets...

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A brief introduction to “apply” in R

August 19, 2010
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A brief introduction to “apply” in R

At any R Q&A site, you’ll frequently see an exchange like this one: Q: How can I use a loop to ? A: Don’t. Use one of the apply functions. So, what are these wondrous apply functions and how do they work? I think the best way to figure out anything in

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R be dragons

August 18, 2010
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Hic sunt dracones used to be placed on maps, as a way to denote a dangerous or otherwise unexplored territory. We might as well write it all over R-related material used in introductory classes, because students seems to be really (…)Read the rest of this entry »

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Homogeneity analysis of hierarchical classifications

August 10, 2010
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Homogeneity analysis of hierarchical classifications

I've spent more years than I care to remember analysing vegetation survey data (typically species abundances in plots) using a variety of software including my own algorithms coded in FORTRAN and C++. A recent query on the r-help list, about how to det...

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Homogeneity analysis of hierarchical classifications

August 10, 2010
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Homogeneity analysis of hierarchical classifications

I've spent more years than I care to remember analysing vegetation survey data (typically species abundances in plots) using a variety of software including my own algorithms coded in FORTRAN and C++. A recent query on the r-help list, about how to determine the number of groups to define in a hierarchical classification produced with the hclust function, prompted...

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R unfolds the history of the Afghanistan war

August 9, 2010
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R unfolds the history of the Afghanistan war

Drew Conway continues his analysis of the Wikileaks data. Having concluded that the data appear legitimate (except perhaps in one region, based on a Benford's Law analysis of the numbers in the documents), Drew follows up with a spatio-temporal analysis of activity within Afghanistan, based on the datelines of the documents themselves (click to enlarge): Each panel represents a...

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How to animate Google Earth with R

August 6, 2010
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How to animate Google Earth with R

We've looked before at how you can annotate geographical maps using R, but what if you want to overlay data onto a globe of the Earth, using Google Earth? The RKML package for R (from the OmegaHat project) allows you to do just that, by providing a high-level interface from R to generate KML files, which in turn are...

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use R! 2010 conference — reflections

August 4, 2010
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From July 20-23, this year's use R! conference took place in Gaithersburg near Washington. I attended the conference as part of my holidays in the U.S. and had a good time there. I met some people, even though that is not the easiest thing for me to do, and I got some inspirations and ideas I outline below:Stat appsOne...

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