March 2010

Video: Hadley Wickham gives a short course on graphics with R

March 23, 2010 | 0 Comments

Hadley Wickham (the creator of the popular ggplot2 graphics package for R) has posted video of a 2-hour short course on Visualisation in R at his blip.tv channel. The video is split into four thirty-minute segments: Basic Graphics Displaying Large Data Data manipulation and transformations Polishing your plots for ... [Read more...]

Playing with the ‘playwith’ package

March 23, 2010 | 0 Comments

Abilities of R for creating graphics is great, but one thing I always missed is the possibility of creating interactive plots and being able to look at graphs while changing one ore more parameters. I know that there is rggobi, but so far I always ran into problems with flexibility ... [Read more...]

R Tips in Stat 511

March 22, 2010 | 0 Comments

Here are some (trivial) R tips in the course Stat 511. I’ll update this post till the semester is over. Formatting R Code Reading code is pain, but the well-formatted code might alleviate the pain a little bit. The function tidy.source() in the animation package can help us format ... [Read more...]

RInside release 0.2.2

March 22, 2010 | 0 Comments

The shiny new 0.2.2 release of RInside has just been uploaded to CRAN; it should hit mirrors tommorow. Sources are also at my RInside page. RInside is a set of convenience classes to facilitate embedding of R inside of C++ applications. It works pa... [Read more...]

R 2.11.0 scheduled for April 22

March 22, 2010 | 0 Comments

Announced this morning on the r-announce mailing list is the impending release of R 2.11.0, scheduled for April 22. As usual, the release soon goes into a beta-test phase, with updated sources to be available on the 22nd and binaries to follow a few days thereafter. [Read more...]

Charting SVN commits with R

March 22, 2010 | 0 Comments

Want to get a quick sense of who are the most active committers to your SVN project? Using just a few lines of R code and the SVN log file, reader and new R user Rhys Kidd created this chart to review commits to the Freespace 2 Source Code Project: Rhys ... [Read more...]

New FECHell 0.1.9

March 22, 2010 | 0 Comments

Our FEC report file library FECHell has been updated to 0.1.9. The release includes a half dozen bug fixes and the following new features: Speed improvements – Schedule and field names names are matched by compiled regular expressions instead of brute-force string matching, resulting in a ~25% speed increase for large files. DEF ... [Read more...]

Example 7.28: Bubble plots

March 22, 2010 | 0 Comments

A bubble plot is a means of displaying 3 variables in a scatterplot. The z dimension is presented in the size of the plot symbol, typically a circle. The area or radius of the circle plotted is proportional to the value of the third variable. This c...
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March insanity

March 22, 2010 | 0 Comments

So I took a brief break from ecology yesterday to pursue another project, modeling the NCAA bracket. I decided to run a stochastic simulation of the tournament. I know this has nothing to do with ecology, but I believe its a good exercise in modeling. Modeling has very little to ... [Read more...]

Health Care Reform vote

March 21, 2010 | 0 Comments

A little bit of churn relative to the House’s 1st shot at this but otherwise a remarkably similar vote, with an estimated cutpoint almost at the same place; see some raw R output, below the fold, after the thumbnail… y is the vote to take up the Senate amendments; ...
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2010 March Madness Half Marathon in Cary

March 21, 2010 | 0 Comments

The annual March Madness Half Marathon in Cary took place this morning. This is both one of Chicagoland's 'early races' to start the season as well as the classic Boston preparation due to the hilly course. I have now run this consecutively for six y... [Read more...]

Converting Siemens MOSAIC

March 21, 2010 | 0 Comments

Siemens multi-slice EPI data may be collected as a "mosiac" image; i.e., all slices acquired in a single TR (repitition time) of a functional MRI run are stored in a single DICOM file.  The images are stored in an MxN array of images.  The function create3D() will try ... [Read more...]

The distribution of rho…

March 21, 2010 | 0 Comments

There was a post here about obtaining non-standard p-values for testing the correlation coefficient. The R-library SuppDists deals with this problem efficiently. library(SuppDists) plot(function(x)dPearson(x,N=23,rho=0.7),-1,1,ylim=c(0,10),ylab="density") plot(function(x)dPearson(x,N=23,rho=0),-1,1,add=TRUE,col="steelblue") plot(function(... [Read more...]

My Experience at ACM Data Mining Camp #DMcamp

March 21, 2010 | 0 Comments

My parents and I made plans to visit San Jose and Saratoga on my grandmother’s birthday, March 19, since that is where she grew up. I randomly saw someone tweet about the ACM Data Mining Camp unconference that happened to be the next day, March 20, only a couple of miles ... [Read more...]
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