DYNA Fall 2025: 29-30 September. More info

Dyalog Ltd
Downloads icon
Video Library icon
Dyalog Support Service icon
Search icon
Dyalog D Logo

The author

Geoff Streeter

Developer

About

Geoffrey Streeter was one of the initial five employees of Dyalog Ltd. and, with John Scholes and David Crossley, developed the first version of Dyalog APL. He continued work in implementation and related projects at Dyalog for over 40 years before retiring in 2023. More about Geoff

Share this page

Phil Goacher (05-11-40 – 09-03-18)

I attended Phil Goacher’s funeral yesterday. He probably had no idea of just how much he would influence the development of APL. I first met Phil at W S Atkins which is a large UK engineering consultancy. There was a sub unit called Atkins Computing which provided internal computing support to the engineers and, crucially, … Read
Calendar icon

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 discussion still surfaces, with John taking the side that they don’t and me taking the side that they do. Essentially, John would argue that after A←2, … Read
Calendar icon

By other authors

Morten Kromberg seated at a desk with two monitors, preparing a recording with lighting equipment set up, during a Dyalog event.

Dyalog ’20 – Recordings Now Available

–

Dyalog ’20 – Recordings Now Available

–

Aarush Bhat standing in a snowy mountain landscape, wearing a black winter jacket and holding a walking pole.

Welcome Aarush Bhat

–

Welcome Aarush Bhat

–

Logo of the APL Problem Solving Competition, showing a stylised grey brain-shaped maze with a circular target symbol on the left hemisphere.

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

–

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

–

Exploring Key

–

Exploring Key

–

Dyalog Ltd
Download Dyalog v19.0

Learn

Training and workshops icon

Products

Dyalog products

Pricing and Licences

Licence icon

For Business

Business intro icon

Community and Resources

Documentation icon

About Us

Duck icon
TryAPL
my.Dyalog
DyalogForums
Dyalog.tv
docs.Dyalog
Bluesky Icon
YouTube icon

Get tips and the latest news. We’ll never spam you. Unsubscribe at any time.

Copyright © 2004 – 2025 Dyalog Ltd.

The APL Trust
Get Support

Technical advice and assistance on all aspects of Dyalog usage is available by e-mail (support@dyalog.com) and/or telephone (+44 1256 830030 – limited to U.K. office hours). Limited advice on design and coding is available, but is not intended to replace the use of the printed and on-line documentation. Except when reporting an issue with the software, users are encouraged to seek advice from the user community via the Dyalog Forum (reading the content of the forums does not require membership).

Search our website...
Quick links:

Getting Started

/

Documentation

/

Downloads

/

Forums