Data-driven Conditionals
ACKNOWLEDGEMENT: My thanks to Andy Shiers for simplifying the examples Visitors to APL from other languages are sometimes a bit sniffy about our use of numbers (1 0) for Boolean values True and False. They’re further bemused by our fondness for moving conditional processing out of code and into data. For example, instead of: 0=2|⍵: […]
Why Dyalog '14 was a Shear Delight
Recent versions of Microsoft Windows support touch screens, which of course means that applications can respond to events originating from touches. Microsoft calls these events “gestures”. Dyalog decided to add support for gestures to version 14.1 and so projects were planned, designs were designed, code was coded and, at Dyalog ’14 (#Dyalog14), a demonstration was […]
Isolated Mandelbrot Set Explorer
It amazes me that an equation so simple can produce images so beautiful and complex. I was first introduced to the Mandelbrot set by the August 1985 issue of Scientific American. Wikipedia says “The Mandelbrot set is the set of complex numbers ‘c’ for which the sequence ( c , c² + c , (c²+c)² + c , […]
Dancing with the Bots
Last week the ‘bots were busy preparing for the J Language Conference in Toronto, where they made their first public appearance together. Upon returning to Bramley they continued training and we are proud to present the first recording of their new dance: [embedplusvideo height=”400″ width=”584″ editlink=”http://bit.ly/1u6Knob” standard=”http://www.youtube.com/v/oO50UqFBsCw?fs=1&vq=hd720″ vars=”ytid=oO50UqFBsCw&width=584&height=400&start=&stop=&rs=w&hd=1&autoplay=0&react=1&chapters=¬es=” id=”ep3993″ /] The ‘bots are both running […]
Creating Shortcuts (Microsoft Windows)
At Dyalog, a developer not only needs access to all of the readily available editions of the interpreter but also to earlier versions that are no longer officially supported. On my Microsoft Windows Desktop I have a folder that contains a shortcut to my developer builds of all these interpreters. I’ve recently suffered a complete […]
Aligning Diff Output
‘Bots are off limits this week so here is a story from this year’s Iverson College – a fantastic week spent in the company of a wonderful mixture of array and functional language gurus and newbies, all learning from each other. One evening, Dhru Patel presented a problem that he was working on which involved […]
APL-Controlled Robot Performs Death-Defying Stunts Using PiCam
Regular readers will remember my whining about the poor precision of both infra-red and ultrasonic sensors. But today, the Raspberry Pi / Dyalog APL – controlled “DyaBot” was observed driving on a dinner table – where the slightest navigational error could mean a 3-foot plunge and certain death! How can this be? [embedplusvideo height=”400″ width=”584″ editlink=”http://bit.ly/19azC9S” […]
PiServer at Thor8.dk
I’ve been wanting to run a Web Server from my home for many years. In fact, I have been paying for the domain Thor8.dk (my street address is Thorsvænget 8), and a fixed IP address for 5 years now – without getting it implemented. But today, with a little help from Jason Rivers who helped […]
APL at work in Africa
My dad is originally from the Cape, and I grew up in Botswana, so hopefully I can be forgiven for feeling that it is very cool to find Dyalog APL at the core of a project which aims to increase financial literacy and support the financial stability of small and medium-sized enterprises in South Africa, […]
Elementary Cellular Light-Emitting Automaton
In response to an earlier post on driving an 8-bar LED using the Raspberry Pi, Roger Hui commented that 8 lights should be sufficient to display the output of a 1-d Game of Life. The code snippets displayed in this post are based on some working code that Roger was also kind enough to forward to me. The […]
