Monthly Archives: August 2012

Who wants to maintain pgfSweave?

August 2, 2012
By

So the time has come for me to face the fact that I have no time to maintain pgfSweave. It was recently archived because I didn’t make necessary changes to comply with some CRAN policies. SO, I need someone to step up to the plate to make some tweakes, put it back up on CRAN

Read more »

Spacing of multi-panel figures in R

August 2, 2012
By
Spacing of multi-panel figures in R

In a previous post, I showed how to keep text and symbols at the same size across figures that have different numbers of panels. The figures in that post were ugly because they used the default panel spacing associated with the mfrow argument of the par( ) function. Below I will walk through how to

Read more »

How do you say “We Will Do Whatever It Takes” in Thai?

August 2, 2012
By
How do you say “We Will Do Whatever It Takes” in Thai?

As the market has already started to poke holes in Draghi’s promise, I thought it would be good to continue the series of posts that I began with the British version “We Will Do Whatever it Takes” with my favorite article written during the Asia ...

Read more »

Data Parallelism Using Oracle R Enterprise

August 2, 2012
By

Modern computer processors are adequately optimized for many statistical calculations, but large data operations may require hours or days to return a result.  Oracle R Enterprise (ORE), a set of R packages designed to process large data computations in Oracle Database, can run many R operations in parallel, significantly reducing processing time. ORE supports parallelism through the transparency layer,...

Read more »

Multivariate Data Analysis Work Flow

August 2, 2012
By
Multivariate Data Analysis Work Flow

Here is an example of a data analysis work flow supported in imDEV. This network visualization was made using CmapTools.

Read more »

Units and metadata

August 2, 2012
By

Handling meta-data is not natural in R, or any traditional rectangular shaped type data storage system.There are several tricks and packages which attempt to solve this problem, with Hmisc using the atrribute feature and the IRange package having its o...

Read more »

CFP: AusDM 2012, deadline extended to 31 August 2012

August 2, 2012
By
CFP: AusDM 2012, deadline extended to 31 August 2012

The Tenth Australasian Data Mining Conference (AusDM 2012) Sydney, Australia 5-7 December 2012 http://ausdm12.togaware.com/ Deadline extended to 31 August 2012 The Australasian Data Mining Conference has established itself as the premier Australasian meeting for both practitioners and researchers in data … Continue reading →

Read more »

unsupervised classification of a Landsat image in R: the whole story or part two

August 1, 2012
By
unsupervised classification of a Landsat image in R: the whole story or part two

The main question when using remote sensed raster data, as we do, is the question of NaN-treatment. Many R functions are able to use an option like rm.NaN=TRUE to treat these missing values. In our case the kmeans function in R is not capable to use such a parameter. After reading the tif-files and creating

Read more »

More on Horizon Charts

August 1, 2012
By
More on Horizon Charts

for background please see prior posts Application of Horizon Plots, Horizon Plot Already Available, and Cubism Horizon Charts in R Some feedback has led me to think that I might have been a little ambitious with my last post on horizon charts. I though...

Read more »

Genetic algorithms: a simple R example

August 1, 2012
By
Genetic algorithms: a simple R example

Genetic algorithm is a search heuristic. GAs can generate a vast number of possible model solutions and use these to evolve towards an approximation of the best solution of the model. Hereby it mimics evolution in nature. GA generates a population, the individuals in this population (often called chromosomes) have  Read more »