The Society has several Special Interest Groups which organise meetings and other activities to enable the exchange of information and views within specific areas of meteorology. These are informal groups of professionals interested in specific technical areas of meteorology. The groups are primarily a way of communicating at a specialist level and are organized and often financed by the group itself. You can use our events database to find out when each group is meeting or alternatively contact the group organiser using the group details
We describe bitslice, a high-performance utility for parallel bit-level indexing of array data. We claim that our results demonstrate the importance of bit arrays as a fundamental data type and of being able to view array data at the Boolean array level. We present performance figures that confirm our claims, taken from a large data broadcast application.
Previous work focused on developing a complete yet concise calculus for programming multidimensional arrays that is based mainly on the essential mathematical properties of computations, that permits the expression of mathematical algorithms as in APL, and that balances abstraction and application. Primitives are defined in an architecture-independent way using algebraic notions, mainly constructors, as in the theory of lists, instead of freely defining operations as in APL. Multidimensional arrays are defined so that they possess a single type, which is a primitive concept independent of other data types or an implementation. Traditional notation for arrays is sometimes more of an obstacle than an aid. We review useful formulas and identities that lack many of the indices typically required. We show how the new notation helps to simplify some of the definitions and proofs. We give a couple examples starting from the specification of a problem.
NP is a program used to help pilots make decisions about flights by providing important navigation information.NP is written in J.This document shows an example of how to take a project and build it from the ground up using J. It does not cover the whole of J but only some of its features.
Many individuals around us will definitely benefit if they are given chances to use and learn APL without worrying about pre-decision financial or procedural obligations whatsoever. This paper proposes such a tool which can be distributed free without violating any commercial rules or business ethics.This tool is an application package created using "Workstation APL2 for Multi-platforms Version 2"; an IBM product announced in May, 2002. According to the IBM license document, free distribution of packaged applications with its run-time facilities is permitted without IBM approval.In its development, I emphasized the aspects of APL2 on the following points:1. Practicality- more business oriented2. Conformity-with the common practice3. Portability-across computing environments4. Support of Japanese Language
