July 2015

Visualization of predictions

July 27, 2015 | Jakob Richter

In this post I want to shortly introduce you to the great visualization possibilities of mlr. Within the last months a lot of work has been put into that field. This post is not a tutorial but more a demonstration of how little code you have to write with mlr ...
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Graph-based circle packing

July 27, 2015 | Michael Bedward

The previous two posts showed examples of a simple circle packing algorithm using the packcircles package (available from CRAN and GitHub). The algorithm involved iterative pair-repulsion to jiggle the circles until (hopefully) a non-overlapping arrangement emerged. In this post we'll look an alternative approach. An algorithm to find an arrangement ... [Read more...]

Graph-based circle packing

July 27, 2015 | Michael Bedward

The previous two posts showed examples of a simple circle packing algorithm using the packcircles package (available from CRAN and GitHub). The algorithm involved iterative pair-repulsion to jiggle the circles until (hopefully) a non-overlapping arrangement emerged. In this post we'll look an alternative approach. An algorithm to find an arrangement ... [Read more...]

Egyptian fractions [Le Monde puzzle #922]

July 27, 2015 | xi'an

For its summer edition, Le Monde mathematical puzzle switched to a lighter version with immediate solution. This #922 considers Egyptian fractions which only have distinct denominators (meaning the numerator is always 1) and can be summed. This means 3/4 is represented as ½+¼. Each denominator only appears once. As I discovered when looking on ...
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Hadley Wickham on why he created all those R packages

July 27, 2015 | David Smith

Priceonomics published on Friday an in-depth profile of Hadley Wickham, author of many of the most popular R packages including ggplot2, dplyr and devtools. In the article, he reveals that his motivation for creating these packages was primarily to provide better ways of accomplishing routine tasks in R, an immensely ... [Read more...]

Announcing: Mastering RStudio

July 27, 2015 | Julian Hillebrand

Learn the holistic use of RStudio to communicate your R code effectively and persuasively. Max (@nierhoff) and I are both absolute R enthusiasts. We both strongly believe in the power of R for statistical computing. And we are both also fascinated by the nearly endless possibilities of the R programming ... [Read more...]

RBerkeley Was Just Pining For The Fjords

July 27, 2015 | Bob Rudis (@hrbrmstr)

UPDATE: RBerkeley is now on CRAN If you made it to Chapter 8 of Data-Driven Security after ~October 2014 and tried to run the BerkeleyDB R example, you were greeted with: Warning in install.packages : package ‘RBerkely’ is not available (for R version [YOUR_R_VERSION]) That’s due to the fact ... [Read more...]

RBerkeley Was Just Pining For The Fjords

July 27, 2015 | Bob Rudis (@hrbrmstr)

If you made it to Chapter 8 of Data-Driven Security after ~October 2014 and tried to run the BerkeleyDB R example, you were greeted with: Warning in install.packages : package ‘RBerkely’ is not available (for R version [YOUR_R_VERSION]) That’s due to the fact that it was removed from CRAN ... [Read more...]

RSoundCloud

July 27, 2015 | Jasper Ginn

Introduction The RSoundCloud package contains two functions with which to query the SoundCloud API. It further contains one convenience function aimed at helping the user to obtain a client id. This id is necessary to query the API. Package informati... [Read more...]

Where do letters occur in words

July 26, 2015 | Mikkel

A while back I encountered an interesting graphic showing where letters were located in english words (http://www.prooffreader.com/2014/05/graphing-distribution-of-english.html). The other day I decided to do a similar one for letters in danish words and for this I used R. I downloaded all abstracts from the danish ... [Read more...]

Predicting Titanic deaths on Kaggle II: gbm

July 26, 2015 | Wingfeet

Following my previous post I have decided to try and use a different method: generalized boosted regression models (gbm). I have read the background in Elements of Statistical Learning and arthur charpentier's nice post on it. This data is a nice occasion to get my hands dirty.Data Data as ... [Read more...]

Predicting Titanic deaths on Kaggle II: gbm

July 26, 2015 | Wingfeet

Following my previous post I have decided to try and use a different method: generalized boosted regression models (gbm). I have read the background in Elements of Statistical Learning and arthur charpentier's nice post on it. This data ... [Read more...]
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