R

Posts in this category are about, or feature, the statistical language ‘R’.

New version of OpenBLAS released

Published by on October 28, 2015

OpenBLAS 0.2.15 has been released. I’ll be building Rblas.dll for Sandy and Ivy bridges on Windows shortly, and would certainly like to hear from anyone else using OpenBLAS and R on Windows.

Padé approximants: CRAN package

Published by on June 10, 2015

While working on the previous post about Padé approximants, a search on CRAN showed that there was only one package which calculated the coefficients, given the appropriate Taylor series: the pracma package. The method it uses seems rather sophisticated, but does allow for calculating coefficients “beyond” that which the Taylor series would allow. Therefore, I Read the full article…

A Practical Example of Calculating Padé Approximant Coefficients Using R

Published by on June 4, 2015 | 1 Response
A Practical Example of Calculating Padé Approximant Coefficients Using R

Introduction I recently had the opportunity to use Padé approximants. There is a lot of good information available on line on the theory and applications of using Padé approximants, but I had trouble finding a good example explaining just how to calculate the co-efficients. Basic Background Hearken back to undergraduate calculus for a moment. For Read the full article…

New package on CRAN: lamW

Published by on May 26, 2015

Recently, in various research projects, the Lambert-W function arose a number of times. Somewhat frustratingly, there is no built-in function in R to calculate it. The only options were those in the gsl and LambertW packages, the latter merely importing the former. Importing the entire GNU Scientific Library (GSL) can be a bit of a Read the full article…

I’ve updated the directions as to how to build 64-bit R for Windows linking to OpenBLAS, as the entire R build process for Windows will change for R version 3.2 and subsequent. I’ve turned it into a static page, instead of a post, in case the build process changes again. While the title has 3.2 in it, the URL doesn’t, so it should be future-proof. Then again, that’s number 47 on the list of 996 famous last words! As always, I’m interested in hearing if anyone successfully builds it and how much of a difference it makes.

I’ve re-written the previous post a bit and now it is posted in the Rcpp gallery. I’ve had some really good comments, so I’ll probably have to post an updated version. Keep the comments coming!

Condorcet ranking and Rcpp

Published by on March 13, 2014 | 9 Responses

I had the opportunity recently to be asked to join a committee which had to select candidates for an upcoming election. In the candidate selection phase, the members of the committee use preferential voting to rank the candidates. Prior to the meeting, I did some research on preferential voting systems. I found two main classes Read the full article…

R programming tips

Published by on January 15, 2014

After reinventing the wheel a few times, I decided it would be a good idea to keep a list of programming tips or tricks that I find useful, so I started a static page here to keep these tips. It will begin rather haphazardly, but if it grows, I will probably categorize and re-order it. Read the full article…