Monthly Archives: June 2011

New patches to speed up R 2.13.0

June 9, 2011
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New patches to speed up R 2.13.0

I have now released a new collection of 30 patches to speed up R version 2.13.0. You can get them here Assessing how much these patches speed up R is difficult. First of all, the speedup varies tremendously with the type of program. It also varies quite a bit with the machine and compiler used

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The R-Files: Jeroen Ooms

June 9, 2011
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The R-Files: Jeroen Ooms

"The R-Files" is an occasional series from Revolution Analytics, where we profile prominent members of the R Community. Name: Jeroen Ooms Background: Ph.D. Candidate, Statistics, UCLA Nationality: Netherlands Years Using R: 3 1/2 Known for: Developing web applications for popular R packages including ggplot2, lme4, stockplot and irttool Jeroen Ooms is a statistical consultant and R enthusiast currently pursuing...

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Rotating disks

June 9, 2011
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Rotating disks

My neighbour is an half-retired entrepreneur who still runs his electric engine company. A few weekends ago, he came to me with the following physics question related with one of those engines: given a primary disk rotating at the angular speed of ω0 and a secondary disk located on the first one with a centre

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R and the Geostatistical Software Library data format

June 9, 2011
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R and the Geostatistical Software Library data format

The *.gslib file format originates from the Geostatistical Software Library, but is also used in the follow-up of that software, i.e. the Stanford Geostatistical Modelling Software (SGeMS). Since not all geostatistical algorithms are implemen...

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gridExtra – Multiple plots from ggplot2

June 8, 2011
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gridExtra – Multiple plots from ggplot2

Thanks to this great post http://www.imachordata.com/?p=730 we can now put multiple plots on a display with ggplot2. This provides somewhat similar functionality to ‘par(mfrow=c(x,y))’ which would allow multiple plots with the base plot function. gridExtra doesn’t have quite the same level of options as ‘par’, but the syntax is simple. grid.arrange( graph1, graph2, ncol=2 Simple. ‘grid.table’

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vRoom vRoom : Speeding up R with C

June 8, 2011
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vRoom vRoom : Speeding up R with C

Many times you don't want to trouble friends for help with menial tasks like moving furniture. But sometimes you need to step out and ask. Your friends are always happy to help, and after the heavy lifting is done you see how easy it can be. R likes to...

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Data Mining in R online course taught by Luis Torgo at statistics.com

June 8, 2011
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An interested PR piece I got from Janet Dobbins: ————— Luis Torgo is teaching an online course, “Data Mining in R: Learning with Case Studies” at statistics.com. The course starts June 17 – July 15. Brief Description: The main goal of this course is to teach users how to perform data mining tasks using R. Instructor(s): Dr. Luis Torgo...

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Making Simple Packages in R on Windows

June 8, 2011
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Making Simple Packages in R on Windows

There are any number of short tutorials on making add on R packages on your Windows machine. This is yet another version of that process. I’ve explained what I did in 10 easy steps on the pages, but I’ll give a brief overview here. In the first step I spent some time updating my R

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A Quantstrat to Build on Part 4

June 8, 2011
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A Quantstrat to Build on Part 4

When we build a system, we are almost always trying to beat buy and hold by some metric or metrics.  I have not found a demo to compare a quantstrat system with a generic buy and hold system.  Here is the way I accomplish a basic comparison w...

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A Quantstrat to Build on Part 3

June 8, 2011
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A Quantstrat to Build on Part 3

This just does the same thing as A Quantstrat to Build on Part 2, but I use sigCrossover and sigComparison instead of sigThreshold as my signal.  Maybe it will help some struggling to understand implementation of the different signal types.  ...

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