Here is an R tip. Use loop indices to avoid for()-loops damaging classes. Below is an R annoyance that occurs again and again: vectors lose class attributes when you iterate over them in a for()-loop. d [1] "2018-02-18 10:16:16 PST" "2018-02-18 10:16:16 PST" for(di in d) { print(di) } #__ … ... [Read more...]

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Recently, I have written and hosted several multi-user Shiny apps. One example, is Taddle that runs on my server at http://taddle.mathematik.uni-ulm.de. Taddle is a multi-user shiny app that offers a free and simple way to allocate seminar topics. (Nex... [Read more...]

The intrval R package is lightweight (~11K), standalone (apart from importing from graphics, has exactly 0 non-base dependency), and it has a very narrow scope: it implements relational operators for intervals — very well aligned with the tiny manifesto. In this post we will explore the use of the package in two ... [Read more...]

The intrval R package is lightweight (~11K), standalone (apart from importing from graphics, has exactly 0 non-base dependency), and it has a very narrow scope: it implements relational operators for intervals — very well aligned with the tiny manifesto. In this post we will explore the use of the package in two ... [Read more...]

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[This article was first published on Digital Age Economist on Digital Age Economist, and kindly contributed to R-bloggers]. (You can report issue about the content on this [Read more...]

In a recent blog post I wrote about having a template for blogdown posts. I wanted to know if it was possible to do this and make my life (and others hopefully) easier for writing new blog posts that are ready to go with the features I frequently re-us... [Read more...]

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In a recent blog post I wrote about having a template for blogdown posts. I wanted to know if it was possible to do this and make my life (and others hopefully) easier for writing new blog posts that are ready to go with the features I frequently re-us... [Read more...]

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Excel users starting to use R likely have some established concepts about data: where it's stored, how functions apply to data, etc. In general, R does things differently to Excel (or any spreadsheet, in fact). In a useful guide, Steph de Silva from Rex Analytics explains the concepts of data ... [Read more...]

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I have just published an interactive graphic showing the effect of ranking scientific communities with pairwise comparison models. The visualisation is an interactive version of my (award-winning) useR!2017 poster, Ranking influential communities in networks. You can see how academic journals have been grouped into communities based on their citation behaviour, ... [Read more...]

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Introduction The RcppArrayFire package provides an interface from R to and from the ArrayFire library, an open source library that can make use of GPUs and other hardware accelerators via CUDA or OpenCL. The official R bindings expose ArrayFire data structures as S4 objects in R, which would require a ... [Read more...]

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Have you ever tried inserting an image into a blogdown post? Maybe you have, or maybe you tried and gave up. Lets first review the hard way before getting to the solution I contributed. The hard way The process involves copying the target image to the static directory that corresponds ... [Read more...]

Have you ever tried inserting an image into a blogdown post? Maybe you have, or maybe you tried and gave up. Lets first review the hard way before getting to the solution I contributed. The hard way The process involves copying the target image to the ... [Read more...]