APL et J



Annonce faite par Dyalog (Mars 2012, en Anglais)

Dear Colleague,

Dyalog has the pleasure of announcing our fourth World Wide APL Programming Contest. The deadline for submissions this year is
August 5th, 2012. The terms and conditions, and the tasks to be solved can be found at: http://www.dyalog.com/contest_2012

Please help us spread the word and tell all your friends about the competition. If you know of anyone you think should be encouraged to participate, please offer to introduce them to the contest – and you could win a referral prize.

The First Prize winner can look forward to US$2,500 plus round trip travel from anywhere in the world to the Dyalog '12 Conference in Elsinore, Denmark, during October 14th-18th 2012. In addition to the grand prize, second and third prizes will be awarded with US$1,200 and US$600 respectively and a further 20 contestants will receive US$100 each.

Additionally, the people or organisations that introduce the winning students to the contest will receive the same dollar prizes – and they need not be students to make the introduction. This means that you (or if you prefer, your organisation) will receive an amount equal to any prizes won by students that you have referred to the competition.

The purpose of the contest is specifically to encourage students and others to investigate APL; the organisers hope that participants will find that exposure to APL broadens their horizons and adds a new tool to their toolbox. A fully featured copy of the latest release of Dyalog APL is available free of charge to students, whether or not they wish to participate in the contest.

Students of other disciplines than Computer Science are encouraged to participate: Many of the most successful APL users have backgrounds in other sciences, and have found APL to be a “Tool of Thought” for expressing solutions to problems in a wide variety of fields.

A total of US$12,600 in prize money has been provided by several sponsors, including US-based Fiserv, Italian based APL Italiana, Danish based SimCorp and UK-based Dyalog Ltd., as well as several anonymous individuals and companies.

We hope that you will help us spread the word. Thank you in advance!

Kind regards,

Gitte Christensen
Managing Director
Dyalog Ltd.


De Charles Hubert:

Esquisse de collision de deux galaxies

De Charles Hubert:

Cinq articles *.PDF et un fichier APL*PLUS pour remplacer les articles traitant des mêmes sujets:
RUNKUT et ICUB concernent les équations différentielles; NEWTON concerne les équations numériques;
VECTABL et EQALIN évitent des doublons dans les trois articles précédents;
EQUAT contient toutes les fonctions APL convernées.
Il y a deux modifications par rapport aux versions précédentes.
On simplifie les équations différentielles: la valeur d'un vecteur d'état comme "xyz" s'écrit xyz au lieu de eta[;lxyz] et l'affectation de sa dérivée s'écrit Dxyz expression au lieu de der[;lxyz]<- expression ce qui facilite la programmation des équations. La même simplification s'applique aux équations numériques.


Cette conférence est maintenant terminée et toutes les informations sont visibles sur le site WWW.APL2010.DE