Monthly Archives: January 2013

Restricted Boltzmann Machines in R

January 14, 2013
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Restricted Boltzmann Machines in R

Restricted Boltzmann Machines (RBMs) are an unsupervised learning method (like principal components). An RBM is a probabilistic and undirected graphical model. They are becoming more popular in machine learning due to recent success in training them with contrastive divergence. They have been proven useful in collaborative filtering, being one of the most successful methods...

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A first example of using Boost

January 14, 2013
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A first example of using Boost

Boost is, to quote the quote by Sutter and Alexandrescu which adornes the Boost website, …one of the most highly regarded and expertly designed C++ library projects in the world. The impact of Boost on C++ cannot be overstated. Boost is, at its core, a collection of thoroughly designed and peer-reviewed libraries. Some of these have...

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R Benchmark: Merge vs fast.merging

January 14, 2013
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Last summer as a trainee I ran into a bit of trouble with the merge function in R. The main problem is that it's slower then your avarage tortoise in a tard field. Also I could not use rbind because of the different lengths of the frames. In code I mea...

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audiolyzR: Data sonification with R

January 13, 2013
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audiolyzR: Data sonification with R

In his talk “Give Your Data A Listen” at last summer’s useR! 2012 conference, Eric Stone presented joint work with Jesse Garrison on audiolyzR, an R package for “data sonification.” I thought this was a nifty and well-executed idea. Since I haven’t seen … Continue reading →

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‘read.morphologika’ update

January 13, 2013
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Update for read.morphologika function. This code will be added to geomorph on our next package update. This update fixes problems with message "object 'incoords' not found". Can be used with example data set mydata_readmorphologika. Here, I p...

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(Dis)Utility

January 13, 2013
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Mart Janssen writes me that he's tried to run the examples for BCEA and pointed out a problem $-$ it all boiled down to a missing script, really, but thanks Mart (if you're reading this)!I've now fixed the problem by updating the file Ut...

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Fun stuff with subtitles or "The Tarantino Threshold"

January 13, 2013
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Fun stuff with subtitles or "The Tarantino Threshold"

Fortunately, there is a page called www.opensubtitles.org, where you can get subtitle (.SRT) files for virtually every movie. Now let's see what we can do with these. SRT files are in plain text format (human readable) and can thus be read quite easily...

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Decluttering ordination plots in vegan part 2: orditorp()

January 13, 2013
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Decluttering ordination plots in vegan part 2: orditorp()

In the earlier post in this series I looked at the ordilabel() function to help tidy up ordination biplots in vegan. An alternative function vegan provides is orditorp(), the last four letters abbreviating the words text or points. That is … Continue reading →

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Huge Discount on Kindle Academic Texts at Amazon — Today Only

January 13, 2013
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Anyone who collects academic texts knows that the hobby can be a bit expensive.  Well, today I happened to notice that there is an incredible deal on Amazon's Gold Box Deal for today for many kindle academic books.  And they are not just unpo...

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European Migration

January 13, 2013
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European Migration

Last week on the radio I heard a story of southern Europeans and Irish looking for better times in northern Europe. I heard the tale of an Italian academic who left Italy to end up waiting tables in an Italian restaurant in the Netherlands. Obviously t...

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