Le Monde puzzle [#755?]

January 27, 2012
By
Le Monde puzzle [#755?]

Le Monde puzzle of last weekend was about sudoku-like matrices. Consider an (n,n) matrix containing the integers from 1 to n². The matrix is “friendly” if the set of the sums of the rows is equal to the set of the sum of the columns. Find examples for n=4,5,6. Why is there no friendly...

Read more »

Replicating NetLogo Fire model

January 27, 2012
By
Replicating NetLogo Fire model

While preparing for the new semester I have started reimplementing standard NetLogo examples in R. The first is Fire...

Read more »

Experimenting With iGraph – and a Hint Towards Ways of Measuring Engagement?

January 27, 2012
By
Experimenting With iGraph – and a Hint Towards Ways of Measuring Engagement?

For fear of being left way behind as Martin Hawksey starts to get to grips with R, (see for...

Read more »

New R User Group in Cleveland

January 27, 2012
By

Another new local R user group has just started up, this time in Cleveland, OH. The Cleveland R User...

Read more »

Parallel R Model Prediction Building and Analytics

January 26, 2012
By
Parallel R Model Prediction Building and Analytics

Modifying R code to run in parallel can lead to huge performance gains. Although a significant amount of...

Read more »

Text Mining and The Danish Immigration Debate

January 26, 2012
By
Text Mining and The Danish Immigration Debate

I have for a while now wanted to learn how to do text mining in R. I have...

Read more »

Filtering a list with the Filter higher-order function

January 26, 2012
By
Filtering a list with the Filter higher-order function

Last week markbulling over at Drunks & Lampposts posted a method of using sapply to filter a list by...

Read more »

Social Media Interest Maps of Newsnight and BBCQT Twitterers

January 26, 2012
By
Social Media Interest Maps of Newsnight and BBCQT Twitterers

I grabbed independent samples of 1500 recent users of the #newsnight and #bbcqt hashtags within a minute or two...

Read more »

All I Don’t Know About Surveys

January 26, 2012
By
All I Don’t Know About Surveys

I believe my survey experiment Survey Time illustrated later in this post and in Google’s Visualization of Survey Responses...

Read more »

SAS Macro Simplifies SAS and R integration

January 26, 2012
By
SAS Macro Simplifies SAS and R integration

Many of us feel very enthusiastic about R. It's free, it features cutting edge applications, it has a large...

Read more »

A Short Example with R-Package osmar..

January 26, 2012
By
A Short Example with R-Package osmar..

Following up my last post in which I praised the capabilities of the osmar-package I give a short example...

Read more »

Exploring the functions in a package

January 26, 2012
By
Exploring the functions in a package

Sometimes it can be useful to list all the functions inside a package. This is done in the same...

Read more »

Hottest 100 for 2011

January 26, 2012
By
Hottest 100 for 2011

Another year, another Australia Day. Another Australia Day, another Triple J Hottest 100. And that, of course, means an...

Read more »

How to create the best Interactive R Language Online Learning Platform from the views of R community?

January 26, 2012
By

How to create the best Interactive R Language Online Learning Platform from the views of R community?: R offers...

Read more »

osmar – Don’t Miss this New R-Geo-Package!

January 26, 2012
By
osmar – Don’t Miss this New R-Geo-Package!

The osmar-package enables you to retrieve all geographic elements of OpenStreetMap via its API.I.e., you can retrieve a street, river,...

Read more »

Paper on org-mode and reproducible research

January 26, 2012
By
Paper on org-mode and reproducible research

As I was talking recently about reproducible research, I have to post this. A new paper by Eric Schulte,...

Read more »

Announcing the winners of the Applications of R in Business contest

January 25, 2012
By

It's with great pleasure that the team at Revolution Analytics announces the winners of the inaugural "Applications of R...

Read more »

ABC [PhD] course

January 25, 2012
By
ABC [PhD] course

As mentioned in the latest post on ABC, I am giving a short doctoral course on ABC methods and...

Read more »

RStudio v0.95 Released

January 25, 2012
By
RStudio v0.95 Released

The final version of RStudio v0.95 is now available for download from our website (thanks to everyone who put...

Read more »

RStudio does not start when using a R version built from source

January 25, 2012
By

Because I do not have root privileges on some of the machines I use, I build part of my...

Read more »

A wordcloud comparison of the 2011 and 2012 #SOTU

January 24, 2012
By
A wordcloud comparison of the 2011 and 2012 #SOTU

I wrote a quick (and very dirty) R script for creating a comparison cloud and a commonality cloud for...

Read more »

Project Euler in R: Problem 25

January 24, 2012
By
Project Euler in R: Problem 25

Solutions in R to Project Euler problems are generally hard to find, so I've recently started posting R solutions on this site.  Here are...

Read more »

BBBT Podcast with David Smith

January 24, 2012
By

Last Friday I was fortunate enough to have the opportunity to travel to Boulder, CO and present R and...

Read more »

Related sites

Sponsors

Your Ad Here


R Quant blog

Contributing Blogs