Dyalog ’26 starts on Monday 12 October

Home / Tips & Tricks

Tips & Tricks

Enhanced Debugging with Function Keys – Evaluate selection

See also Enhanced Debugging with Function Keys. When tracing through a complex dfn and reaching a guard (condition:result), I am often wary of tracing into... Read

December 2020

Adám Brudzewsky

Towards Improvements to Stencil

Background The stencil operator ⌺ was introduced in Dyalog version 16.0 in 2017. Recently we received some feedback (OK, complaints) that (a) stencil does... Read

June 2020

Roger Hui

Enhanced Debugging with Function Keys

Sometimes I want an additional functionality in the IDE. (Are you a RIDE user? We’ll cover that too!) For example, the other day, I was tracing through... Read

September 2018

Adám Brudzewsky

I-Beam Mnemonics

I-Beam (⌶) is an operator that takes as its operand a numeric code and derives a function which isn’t really considered to be part of the APL language... Read

June 2016

Richard Smth

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

Quicksort in APL Revisited

A message in the Forum inquired on sorting strings in APL with a custom comparison function. First, sorting strings without a custom comparison function... Read

February 2016

Roger Hui

Zero-length Regular Expression Matches Considered Harmful

I was asked by a colleague why ⎕S reports two matches in the following example: ('d*'⎕S 0 1)'321' ┌───┬───┐ │0 3│3 0│... Read

February 2015

Richard Smth

Three-and-a-bit

The most obvious expression for computing π in APL is ○1. But what if you can’t remember how ○ works, or your O key is broken, or you feel like... Read

January 2015

Jay Foad

Solving the 2014 APL Problem Solving Competition – it’s as easy as 1 1 2 3…

The winners of the 2014 APL Problem Solving Competition were recognized at the Dyalog ’14 user meeting and had a chance to share their... Read

November 2014

Brian Becker

A Speed-Up Story

The first e-mail of the work week came from Nicolas Delcros. He wondered whether anything clever can be done with ∘.≡ on enclosed character strings. I... Read

November 2014

Roger Hui

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... Read

July 2014

John Daintree