Monthly Archives: September 2011

Use of Classification Trees to Investigate Traits of Invasive Species

September 20, 2011
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Use of Classification Trees to Investigate Traits of Invasive Species

Which traits make an alien species invasive?Due to what traits an alien species becomes established in a foreign flora?This kind of questions could be analysed by the use of recursive partitioning and classification trees..(the below example also inclu...

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Cricket All Round Performances

September 19, 2011
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In cricket a player who can perform well with both the bat and bowl is a great asset for any team and across the history of international cricket there have been a number of cricketers that hall into this bracket. It is difficult to specify a set of criteria to determine whether a player can

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About commercial publishers

September 19, 2011
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About commercial publishers

Julien Cornebise has pointed out a recent Guardian article. It is about commercial publishers of academic journals, mainly Elsevier, Springer, and Wiley, with a clear stand from its title: “Academic publishers make Murdoch look like a socialist“! The valuable argument therein is that academic publishers make hefty profits (a 40% margin for Elsevier!)

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Using jri to connect JAVA to R

September 19, 2011
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The R package rJava allows R to be accessed in Java programs. The part of the package that allows this is jri. The notes on the rJava site about getting jri to work didn’t help me much getting it to … Continue reading →

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R 2.14 to be released on October 31; R 2.13 patch on September 13

September 19, 2011
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The next major release of R has been announced: R 2.14.0 is scheduled for October 31. Details are still coming in about the new features planned for this release, but R core member Luke Tierney has revealed some of the performance improvements expected, and R core member Brian Ripley has spoken of forthcoming low-level support for multi-threaded computing and...

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Appendable saving in R

September 19, 2011
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One of the most crucial problems in HPC is that every error you make have much greater impact than in the normal computing — there is nothing more amusing than finding out that few-day simulation broke few minutes before the end because of an unfortunate value thrown by a random generator, typo in result saving code or

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Three free books for better programming in R (and any other language)

September 19, 2011
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Like many users and producers of R packages, I have never had any formal training in computer science. I’ve come to to the conclusion that this is a serious omission in a professional researcher’s training. Computer scientists and professional hackers … Continue reading →

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rgdal + raster + RCurl = My next package

September 18, 2011
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rgdal + raster + RCurl = My next package

This package has been a long time in the making.  In the end it’s more of a data package than a functional package, but pulling all the pieces together required me to learn some really cool packages: raster ( which I already knew ) rgdal and RCurl.  I’ll provide a littel bit of an overview

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DTW: dynamic time warping 动态时间规整

September 18, 2011
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Basically, DTW (dynamic time warping) is an algorithm to output cumulative distance of two time sequences, which is widely used e.g. for classification and clustering.For example, when using k-mean for clustering, we can use DTW as distance function. Here is one of such nice instances (using R: http://www.rdatamining.com/examples/ts-mining)Relevant information from Anshul's email.  A review of DTW http://csdl.ics.hawaii.edu/techreports/08-04/08-04.pdfCode:Python code: https://mlpy.fbk.eu/R...

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Map the distribution of your sample by geolocating ip addresses or zip codes

September 18, 2011
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Map the distribution of your sample by geolocating ip addresses or zip codes

Yesterday I wanted to create a map of participants from a study on social media and partisan selective exposure that Sean Westwood and I ran recently, with participants from Amazon’s Mechanical Turk.  We recorded ip addresses for each Turker participant, so … Continue reading →

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