Blog Archives

Updated OpenBLAS instructions for R-3.3+ and Rtools34

July 19, 2016
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I’ve just updated the instructions for building a 64-bit OpenBLAS-based Rblas.dll for Windows to reflect changes to R 3.3+ and Rtools34. Enjoy!

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Updated R & BLAS Timings

March 30, 2016
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Updated R & BLAS Timings

With the recent releases of R 3.2.4 and OpenBLAS 2.17, I decided it was time to re-benchmark R speed. I’ve settled on a particular set of tests, based on my experience as well as some of Simon Urbanek’s work which I separated into two groups: those focusing on BLAS-heavy operations and those which do not. Read the full...

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New version of OpenBLAS released

October 28, 2015
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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.

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Padé approximants: CRAN package

June 10, 2015
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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...

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A Practical Example of Calculating Padé Approximant Coefficients Using R

June 4, 2015
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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...

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New package on CRAN: lamW

May 26, 2015
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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...

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Updated directions on building 64-bit Rblas using OpenBLAS for R 3.2

March 16, 2015
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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 Read the full...

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