APL

Fractals can be represented by means of L-systems (Development Grammars), together with a graphic interpretation. Two families of graphic interpretations have been used: turtle graphics and vector graphics. This paper describes an APL2/PC system able to ...

The cross-tabulation technique is a common tool for data analysis and other statistical purposes. But when the datasets are large the standard software such as spreadsheet programs cannot process all the data or the database programs are too slow. It is ...

The Global Positioning System (GPS) consists of a constellation of 24 high-altitude satellites with very accurate atomic clocks, along with a global network of satellite tracking stations and sophisticated ground processing stations, that together ...

APL2 has often been used in a credit course at the Technical University of Denmark. The objective of the course exercise has been to analyze the vocalizations of Sperm Whales. In January 1996 the course was run again, this time using the IBM SP/2 ...

The dynamics of mechanical and/or control systems is traditionally documented by plots of system variables. The imagination of the underlying movements is restricted to very simple cases.ANDYMMO enhances imagination by introducing the possibility to see ...

APL and J are seldom, if ever, used in the teaching of college or university courses. Recently, the author has developed a new laboratory based computer science course for liberal arts students in which students are introduced to 13 core computer ...

This paper will touch on the lack of mechanisms to pass arguments back from defined functions other than return values, if return values are already used as error codes. An extreme case is the use of call-back functions, or event procedures, to the ...

Human economic decisions are characterized by a number of factors which make them difficult to model with standard mathematical tools. Decisions can be more easily described by a set of rules, and some of them may be "rules of thumb". Economic behavior ...

Economic forecasting is of great importance when some economic mechanism is changed rapidly as in Russia nowadays. Any economic system is a deterministic-stochastic entity of great complexity. Because of this, informative models which offer the ...

This paper describes an application oriented approach to the genetic-algorithm technique. The software is implemented in APL2 and exploits availability of user defined operators and separation of general purpose and problem specific code. The paper ...