Articles by Han de Vries

Regular Sequences

August 19, 2019 | Han de Vries

So far in this series, we used vectors from built-in datasets (rivers, women and nhtemp), or created them by stringing together several numbers with the c function (e.g. c(1, 2, 3, 4)). R offers an extremely useful shortcut to create vectors of the latter kind, which is the colon : operator. Instead of ...
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Vectors and Functions

August 12, 2019 | Han de Vries

In the previous set we started with arithmetic operations on vectors. We’ll take this a step further now, by practising functions to summarize, sort and round the elements of a vector. Sofar, the functions we have practised (log, sqrt, exp, sin, cos, and acos) always return a vector with ...
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Working With Vectors

August 5, 2019 | Han de Vries

In the previous exercise set we practised vectors as a data structure. As I noted at the beginning of that set, perhaps you were already familiar with data in a vector-like structure in other applications such as Microsoft Excel or SPSS. If so, perhaps you also used those data to ...
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Creating vectors

July 29, 2019 | Han de Vries

A vector is the most elementary way to store and structure data in R. For now, think of it as a list of numbers, which can be as short as a single number, or as long as about 2 billion(!) numbers. Perhaps you were used to working with lists of numbers ...
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How to create your first vector in R

May 1, 2017 | Han de Vries

Are you an expert R programmer? If so, this is *not* for you. This is a short tutorial for R novices, explaining vectors, a basic R data structure. Here’s an example: 10 150 30 45 20.3 And here’s another one: -5 -4 -3 -2 -1 0 1 2 3 still another one: "Darth Vader" "Luke […] Related exercise ... [Read more...]

Celebrating our 100th R exercise set

December 28, 2016 | Han de Vries

Yesterday we published our 100th set of exercises on R-exercises. Kudos and many thanks to Avi, Maria Elisa, Euthymios, Francisco, Imtiaz, John, Karolis, Mary Anne, Matteo, Miodrag, Paritosh, Sammy, Siva, Vasileios, and Walter for contributing so much great material to practice R programming! Even more thanks to Onno, who is ... [Read more...]

Data table exercises: keys and subsetting

March 21, 2016 | Han de Vries

The data.table package is a popular R package that facilitates fast selections, aggregations and joins on large data sets. It is well-documented through several vignettes, and even has its own interactive course, offered by Datacamp. For those who want to build some mileage practising the use of data.table, ... [Read more...]

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