March 2012

Julia, I Love You

March 31, 2012 | 0 Comments

Julia is a new language for scientific computing that is winning praise from a slew of very smart people, including Harlan Harris, Chris Fonnesbeck, Douglas Bates, Vince Buffalo and Shane Conway. As a language, it has lofty design goals, which, if attained, will make it noticeably superior to Matlab, R ... [Read more...]

Back to Blogging

March 31, 2012 | 0 Comments

If you’re subscribed to this blog, you’ve surely noticed the very long hiatus I’ve taken from writing over the last six months. I wish I’d kept up with blogging more faithfully this year, but, in my defense, I’ve been busy doing a few big things: ... [Read more...]

More on Philadelphia Homicide

March 31, 2012 | 0 Comments

I've been doing more analysis of the Philadelphia Homicide data that the Philadelphia Inquirer has published, and presented some of it at the Philadelphia UseR group yesterday. My slides [pdf] and source [knitr .Rnw] are on github.I should be clear tha...
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Draw Your Breast with CloudStat – A R Apps (for fun)

March 31, 2012 | 0 Comments

This is a simple apps, called “Draw Your Breast with R“  created with R to generate Breast alike graphics. With this Draw Your Breast with R apps, you can change 4 parameters which are Theta, Phi, Expand and Color to generate graphics like... [Read more...]

GBLUP example in R

March 30, 2012 | 0 Comments

Shirin Amiri was asking about GBLUP (genomic BLUP) and based on her example I set up the following R script to show how GBLUP works. Note that this is the so called marker model, where we estimate allele substitution effects of the markers and not individual based model, where genomic ... [Read more...]

See the wind

March 30, 2012 | 0 Comments

The image below isn't a bearskin rug in the shape of the USA. It's fact, it's a visualization of the wind flowing over the United States, as of 4PM EDT today, March 30. You can click through to see the current wind conditions, based on latest data from the National Digital ... [Read more...]

R 2.15.0 "Easter Beagle" is released

March 30, 2012 | 0 Comments

The R core group today announced the availability of R 2.15.0, codenamed "Easter Beagle". If you build R yourself, the new source distribution (including packages for Debian Linux) is available now, and binaries for Windows, MacOS and Linux will be available from your local CRAN mirror over the next couple of ... [Read more...]

Build 32 bit R on 64 bit Ubuntu by utilizing chroot

March 30, 2012 | 0 Comments

In the past, I’ve described how one could build multiarch (64 bit and 32 bit) versions of R on a 64 bit Ubuntu machine. The method based on this thread no longer works as of R 2.13 or 2.14 I believe. I received advice from someone on #R over on freenode (forgot who) a ... [Read more...]

Comparing Spectra with different math treatments

March 30, 2012 | 0 Comments

It is amazing the quantity of graphics you can develop with R, and how you can show and manage  these graphics. Here in the same plot we compare the raw demo spectra, treated with MSC, SNV and with the first derivative (differences between consecu...
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Slow R graphics via SSH

March 30, 2012 | 0 Comments

I do most of my R work on a server via SSH.  Viewing graphics (i.e. plot()) can be excruciatingly slow through the SSH pipe, but it's easy to make it fast.  Simply run:        X11.options(type="Xlib")once in the R session....
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Maths can be cool (to impress your kids)

March 30, 2012 | 0 Comments

Just imagine that your kids need some help, to prepare fishes for April 1st, like Her: "please, Daddy, help us to draw some fishes" Me: "Sure, Daddy is a champion, actually, I do that everyday at work: drawing fishes - and more generally nice stuf... [Read more...]

BoRdeaux (France): the first French R useR conference

March 30, 2012 | 0 Comments

The first French R useR conference will be held in Bordeaux on July 2-3. The Rencontres R are conceived as a place to present and share ideas on using the R statistical software. This meeting is designed to be a nationwide event where various topics belong, such as graphical tools, ... [Read more...]

Bootstrap example

March 30, 2012 | 0 Comments

Bootstrap your way into robust inference. Wow, that was fun to write.. Introduction Say you made a simple regression, now you have your . You wish to know if it is significantly different from (say) zero. In general, people look … Continue reading → [Read more...]
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