Monthly Archives: July 2010

Core in CiRM [1]

July 6, 2010
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Core in CiRM [1]

Jean-Michel Marin and myself have thus started our “research in pair” in CIRM, Luminy, for a fortnight. We are working on the second edition of Bayesian Core and, despite working round the clock on the project (except for a one hour run around Mont Puget this morning), we are not going as fast as planned…

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Draw a trophic network with n levels

July 6, 2010
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Draw a trophic network with n levels

I published a short function to draw trophic networks with several levels, with links going from level n+1 to level n only. It will only be of interest for people working in ecology (but if you see another possible use, please let me know). It is available here – with examples. If I continue to

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Chaos in the Financial Markets?

July 6, 2010
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Chaos in the Financial Markets?

Over the years I've had quite a few interested individuals ask me about Chaos and its applications towards trading. Well, as hidden markov models and speech processing were made popular by James Simons and his team at Renaissance Technologies, one cou...

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Draw a trophic network with n levels

July 6, 2010
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In the last few weeks, I started focusing more on more of trophic systems with three levels or more. I wanted something to visualize the resulting trophic network, so I came up with a little R function called draw.mnet (which stands for draw a multiple-levels network).

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Ross Ihaka in Sunday Star Times

July 6, 2010
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Ross Ihaka in Sunday Star Times

New Zealand's Sunday Star Times last weekend featured a profile on Ross Ihaka, co-creator of R: The down-to-earth associate statistics professor and his fellow researcher Robert Gentleman are famous around the world for developing R programming – a "glorified calculator" that crunches data. R programming allows for statistical computing and graphics and is used by thousands of companies worldwide...

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New versions of plyr, ggplot2 released

July 6, 2010
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Hadley Wickham has announced that new versions of his popular grammar-of-graphics charting package ggplot2 and his general-purpose data reshaping tool plyr for R are now available. plyr boasts several new features, most notably a new join function which should simplify what can sometimes be a difficult process in R: merging two data sets. A simplified SQL-like terminology should make...

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Example 8.1: Digits of Pi

July 6, 2010
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Example 8.1: Digits of Pi

Do the digits of Pi appear in a random order? If so, the trillions of digits of Pi calculated can serve as a useful random number generator. This post was inspired by this entry on Matt Asher's blog. Generating pseudo-random numbers is a key piece o...

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R goes to StackExchange

July 6, 2010
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R goes to StackExchange

“What’s the big deal? We already have the r-help mailing list.” No, it’s a big deal. Really. Have you forgotten the joys of being a first-year R user, either begging advice off of friends or using Google to search archives of the R-help list? (Firefox has a dedicated search add-on for the R-help archives.) Yes,

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oro.nifti 0.2.0

July 6, 2010
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The latest version of oro.nifti (0.2.0) has been released on CRAN.  New features include:Reduced overall size of the package by an additional 50% This is a 75% reduction in total from version 0.1.4Four-dimensional acquisitions are now re-orient...

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oro.nifti 0.2.0

July 6, 2010
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The latest version of oro.nifti (0.2.0) has been released on CRAN.  New features include:Reduced overall size of the package by an additional 50% This is a 75% reduction in total from version 0.1.4Four-dimensional acquisitions are now re-orient...

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