How to write Functions in R
In this tutorial we look at how to write functions in R. What are functions? Functions are user defined pieces
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September 2016
mapply and by functions in R
In the previous tutorial we looked at the apply group of functions. In this example we look at mapply and by
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Functions in R – apply, lapply, sapply, tapply, simplify2array
In the previous tutorial we saw the different control structures in R. In this tutorial we will look at the following
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Accessing LOCA Downscaling Via OPeNDAP and the Geo Data Portal with R.
Introduction
In this example, we will use the R programming language to access LOCA data via the OPeNDAP web service interface using the ncdf4 package then use the geoknife package to access LOCA data using the Geo Data Portal as a geoprocessing service. More examples like this can be found ...
Volunteer to help improve R’s documentation
The R Consortium, in its most recent funding round, awarded a grant of $10,000 to The R Documentation Task Force, whose mission is to design and build the next generation R documentation system. (Microsoft is a Platinum Member of the R Consortium.) The task force has the support and participation of ... [Read more...]
Did Wages Detach from Productivity in 1973? An Investigation
This is the third and final blog post in my series on income inequality. This post discusses the detachment of compensation from productivity that occured around 1973. I look at the data and use R for exploring this break, along with why it may have occured. R code is with the ...
Analysing the Modelled Territorial Authority GDP estimates for New Zealand
At the conference of the New Zealand Association of Economists (NZAE) in late June 2016 I gave a paper on Modelled Territorial Authority Gross Domestic Product, a new dataset my team developed last year in my day job. See the official website of the M... [Read more...]
Some insights in soccer transfers using Market Basket Analysis
Introduction Although more than 20 years old, Market Basket Analysis (MBA) (or association rules mining) can still be a very useful technique to gain insights in large transactional data sets. The classical example is transactional data in a supermarket. For … Continue reading →
Telco churn prediction with R+H2O
Recently together with my friend Wit Jakuczun we have discussed about a blog post on Revolution showing application of SQL Server R services to build and run telco churn model. It is a very nice analysis and we thought that it would be interesting to compare the results to H2... [Read more...]
Suggestions for how R and RStudio could improve auto-completion and usability of R
RStudio has improved the power of auto-completion in R and generally increased usability. However, there remains the potential to improve discoverability and usability. There are also coding practices that R package authors can adopt both to work better with auto-complete and make the features of their R package more discoverable. ... [Read more...]
Clustering using the ClusterR package
This blog post is about clustering and specifically about my recently released package on CRAN, ClusterR. The following notes and examples are based mainly on the package Vignette.
Cluster analysis or clustering is the task of grouping a set... [Read more...]
Weapons of Math Destruction – A Data Scientist’s Guide to Disarmament
I’ve had this book on pre-order since spring and it finally arrived on Friday. I subsequently devoured it over the weekend. The book lays out a clear and compelling case for how data-driven algorithms can become — in contrast to their promise of amoral objectivism — efficient means for reproducing and ...
Hunspell 2.0: High-Performance Stemmer, Tokenizer, and Spell Checker for R
A new version of the ropensci hunspell package has been released to CRAN. Hunspell is the spell checker library used by LibreOffice, OpenOffice, Mozilla Firefox, Google Chrome, Mac OS-X, InDesign, Opera, RStudio and many others. It provides a system for tokenizing, stemming and spelling in almost any language or alphabet. ... [Read more...]
velox – Fast Raster Manipulation and Extraction in R
I’m happy to announce that I’ve recently published the velox R package. velox allows performing common raster operations in R much faster than alternative packages. The following plot provides a brief overview of the speed-up associated with using velox, as opposed to the well-known raster package: velox is ...
stringdist 0.9.4.2 released
stringdist 0.9.4.2 was accepted on CRAN at the end of last week. This release just fixes a few bugs affecting the stringdistmatrix function, when called with a single argument. From the NEWS file: bugfix in stringdistmatrix(a): value of p, for … Continue reading →
Data Scientist with a wine hobby (Part I)
After high school I made my way from Johannesburg, situated in the northern part of South Africa, to the famous wine country known as Stellenbosch in the south. Here for the first time I got a ton of exposure to wine and the countless varietals that ma... [Read more...]
Quick Tip : Overlaying curves on Tableau scatter plots with R
Tableau provides a good set of trend line, reference line and band options but sometimes you want to overlay curves based on a custom equation. Logistic regression curves, sine curves, quantile regression curves…. And want these overlay curves to be smooth… This is very easy to do by taking advantage ...
What is the cost of a progress bar in R?
The pbapply R package adds progress bar to vectorized functions, like lapply. A feature request regarding progress bar for parallel functions has been sitting at the development GitHub repository for a few months. More recently, the author of the pbmcapply package dropped a note about his implementation of forking functionality ... [Read more...]
RSelenium: A wonderful tool for web scraping.
For one of my projects, I needed to fetch data in R from online sources. We all know that its a common practice to collect data from Twitter, Facebook and other online social media websites and analyse them. I used to do the same using the XML package until a ... [Read more...]
New package gettz on CRAN
gettz is now on CRAN in its initial release 0.0.1.
It provides a possible fallback in situations where Sys.timezone() fails to determine the system timezone. That can happen when e.g. the file /etc/localtime somehow is not a link into the correspondi... [Read more...]
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