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Musings

Diane’s Lasagne Problem

Making Lasagne Participants in the SA2 Performance Tuning workshop at the Dyalog ’18 User Meeting were encouraged to bring their own problems for the group… Read

November 2018

Roger Hui

Permuting Internal Letters

Friday Afternoon It’s something of a custom in Dyalog to send a “fun” e-mail to the group on Friday afternoons. My gambit for this past… Read

January 2018

Roger Hui

50847534

⎕io←0 throughout. I was re-reading A Mathematician’s Apology before recommending it to Suki Tekverk, our summer intern, and came across a statement… Read

September 2016

Roger Hui

Constructions

Suki Tekverk, a summer intern, spent the last two weeks here studying APL. She will be a high school senior next September and is adept in math, so in addition… Read

August 2016

Roger Hui

The Story of a Summer Intern

by Suki Tekverk As a born and raised New Yorker, I thought I had seen it all, but two short weeks spent in Vancouver with Roger Hui and his family proved me… Read

August 2016

guestBlogger

Loops, Folds and Tuples

For-loops Given an initial state defined by a number of variables, a for-loop iterates through its argument array modifying the state. A←... ⋄… Read

May 2016

John Scholes

Type Comments

I’ve taken to commenting the closing brace of my inner dfns with a home-grown type notation pinched from the Functional Programming community: dref←{… Read

July 2015

John Scholes

Response to Name Colouring for Dfns

This post contains comments to John Scholes’ post on name colouring; please continue to post any further comments with the original post. This is a very… Read

June 2015

Morten Kromberg

Name Colouring for Dfns

APL is sometimes criticised because expressions that include names cannot, in general, be parsed without knowing whether the names represent functions or… Read

May 2015

John Scholes

Do Functions Know Their Own Names?

Going back a long way when John Scholes and I were writing version 0 of Dyalog there was a big discussion about whether functions knew their own names. This… Read

May 2015

Geoff Streeter

Unforgettable Numbers

Professor Kip Murray asked on the J Forum for the “unforgettable” times seen on a 24-hour digital clock. The problem is that every number has… Read

March 2015

Roger Hui

Foo, Shmoo

“We do not realize what tremendous power the structure of an habitual language has. It is not an exaggeration to say that it enslaves us through the… Read

February 2015

John Scholes

What’s Your Favourite Beautiful Squiggle?

Roger’s post speculating on Ken Iverson’s favourite APL expression reminded me that one of the delegates at Dyalog ’14 conducted a quick… Read

December 2014

Fiona Smith

Ken Iverson’s Favourite APL Expression?

What was Ken Iverson’s favourite APL expression? I don’t know that he had one and if he had I don’t know what it was, but if I have to guess …… Read

December 2014

Roger Hui

Musings on Reduction

In one man’s humble opinion, reduction (⌿) is the Queen of Operators. Each (¨) comes a close second, but doesn’t get the cigar because each can… Read

November 2014

John Scholes