This section will be updated irregularly with pages on applications of BMS. It intends to concentrate on two things:
Some add-on code to extend the functionality of BMS in a certain direction, such as e.g. BMA and spatial filtering
Usage of BMS to re... [Read more...]
I tried to implement the Strassen's algorithm for big matrices multiplication in R.Here I present a pdf with some theory element, some example and a possible solution in R.I'm not a programmer, so the function is not optimize, but it works.I want to th... [Read more...]
Fringe provides an excellent example of cointegration. This is a television show in which there are two adjacent universes. The universes are almost alike but not exactly. Now, everyone knows that history is chaotic. If a butterfly does an extra flap of its wings, then that difference spreads out to ...
UPDATE: holy open source to the rescue. I posted a question yesterday on a idea peter had. Transaprency for overlaying light maps onto google maps. reminds me of the old Quake days. Well, I know John Carmack, John is an old friend of mine, but I’m no John Carmack. ...
his blog post is mainly for Stat 579 students on the homework for week 7, since I received too many “gory” loops in the homework submissions and I think it would help a bit to write my thoughts on R loops for beginners. The immortal motto for newbies in programming is: If ... [Read more...]
Our "arm" package in R requires Doug Bates's "lme4" which fits multilevel models. lme4 is currently having some problems on the Mac. But installation on the Mac can be done; it just takes a bit of work. I have two...
[Read more...]
After recently discovering the excellent methods section on mappingonlinepublics.net, I decided it was time to document my own approach to Twitter data. I’ve been messing around with R and igraph for a while, but it wasn’t until I discovered Gephi that things really moved forward. R/igraph ... [Read more...]
The current puzzle in Le Monde this week is again about prime numbers: The control key on a credit card is an integer η(a) associated with the card number a such that, if the card number is c=ab, its key η(c) satisfies η(c)=η(a)+η(b)-1. There is only ... [Read more...]
After a somewhat long hiatus,
RPostgreSQL version 0.1-7 has now been released to
CRAN. RPostgreSQL
connects R to
PostgreSQL database systems using the standard
DBI interface.
This version fixes a number of issues that had been compiled in the
issu... [Read more...]
In part 1 and part 2 we went over the background of nightlights and the fundamental problem: Station inventory data had errors in it: In Hansen 2010, Hansen writes: “ Station location in the meteorological data records is provided with a resolution of 0.01 degrees of latitude and longitude, corresponding to a distance of about 1 [...]
The 2010 ggplot2 Case Study Competition Winners have been announced! Congratulations to the winners!Grand Prize: David Kahle, Rice UniversityFinalist: Michael Lavine, UMass Amherst Finalist: Claudia Beleites, TU Dresden & Uni.... [Read more...]
In part 1 we discussed UHI in a general way and introduced NASA’s use of nightlights to identify Rural, periurban and Urban stations. Very simply, the latitude and longitude data in the station inventory is used to look up at radiance value in the nightlights file. If that value is 10 ...
Benoît Mandelbrot, the father of fractals, died Thursday at the age of 85. His obituary in the New York Times covers his life and work, and is also a well-written introduction to fractals. Mandelbrot's famous book, The Fractal Geometry of Nature, was an inspiration to me in high school: that ... [Read more...]
Bill Alpert of Barron’s has demonstrated the use of R in financial journalism as he criticized the performance of Jim Cramer’s stock picks. Patrick Burns was an advisor for the analysis done in the article. R was an important tool that allowed them to do their research as ... [Read more...]
Version 0.2.8 of RcppArmadillo
is now on CRAN. This updates the included
Armadillo template library to
version 0.9.90 which Conrad released two few days ago.
RcppArmadillo
makes it easy to write highly efficient and highly readable C++ code for line... [Read more...]
Mandelbrot on taxonomy (from 1955; the first publication about fractals that I know of): Searching for Mandelbrot on the blog led me to Akaike, who also recently passed away and also did interesting early work on self-similar stochastic proces... [Read more...]
Nicholas Taleb and Recent tweets indicate that Benoit Mandelbrot has died at age 85. Mandelbrot was a French and American mathematician, best known as the father of fractal geometry. His official biography at Yale does n... [Read more...]
As a gay guy, you sometimes have to put up with some pretty offensive stereotypes that get thrown your way by extremists in the community and the media. These stereotypes are usually deployed in the form of anecdotes about how gay people are "promiscuous" or "corrupting". These misrepresentative anecdotes have ... [Read more...]