Articles by densurekalkun

Click n click (GC606J1)

August 26, 2019 | densurekalkun

Today’s puzzle is a single part of a mystery that comprises several smaller puzzles, styled on the cult classic TV show The Crystal Maze. To get the coordinates there is a “mental” test for the northings, two easy puzzles that I won’t go into here. The westings are ...
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Plotting Pairs (GC4W6HJ)

August 14, 2019 | densurekalkun

Planning for a trip to Cornwall, I was churning through some mysteries there, largely picking them at random from the map. I worked my way through this one by hand, copying the puzzle into a text editor and separating the pairs manually before finally transferring it into RStudio and plotting ...
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GC4XMN7 RR138 – 404 Found

August 2, 2019 | densurekalkun

It’s been a few weeks since I found a puzzle worth programming in R, so I turned back to the RR series in the east of England to see if there was another, and there is. The cache page shows a quite unilluminating image, mostly white with a couple ...
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GC5GRBF RR175 – Polymath

July 13, 2019 | densurekalkun

There is a series of puzzle caches in the east of England with a great number of interesting abstract puzzles, some of which are R-able. Amongst this estimable collection is one which is itself a miniature collection of puzzles. I saw it yesterday and starting working on the fifteen small ... [Read more...]

GCTV41 Magic Eye View

July 3, 2019 | densurekalkun

Remember Magic Eye pictures? It was a craze in the 1990s where you would get books of abstract Pollockesque images, and, using a special technique, you could see a “3D” image. The technique, which I could never properly master, was to see “through” the page, focusing your gaze on a ...
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July 3, 2019 | densurekalkun

I stumbled upon a nice little puzzle in Gloucestershire, England: Arrange the numbers 1 to 16, so each two numbers next to each other, add up to a square number. (You can only use each number once). Devastatingly succinct. But potentially tricky. I reached out, as I always do, to R to ... [Read more...]

GC4F5HY Shredded – JPS09

June 25, 2019 | densurekalkun

This puzzle is in Jersey and features an image, which, judging by the colours and rough shape, is obviously a scrambled version of a map of Jersey. The text confirms that a map has been “shredded”, and your task is to unshred it. I’m intrigued to know how they ...
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June 21, 2019 | densurekalkun

The tidyverse collection of packages is a suite of packages that simplifies a huge number of the commonest tasks I do in R. It’s become indispensable for me, and I’ll make heavy use of it. I draw your attention to dplyr, one of the tidyverse packages. It provides ... [Read more...]


June 21, 2019 | densurekalkun

The magrittr package is a great resource for making R more readable… and more writable. Here’s an example of hard-to-read code print(head(rev(toupper(letters)))) If you came across that in someone else’s code, you might gag. And rightly so. It takes a few moments to work ... [Read more...]

hello woRld

June 21, 2019 | densurekalkun

This blog is about the intersect between my two big passions: Geocaching and R programming. Geocaching is an international treasure hunt, where you seek containers hidden by other cachers, using your phone or a GPS receiver. R is a programming language which is commonly used in statistics-heavy academic and professional ... [Read more...]

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