A control structure is described which is more APL-ish than the currently implemented keywords. It is much more in the spirit of APL because it merges all conventional control concepts into one single concept represented by one single symbol "∇". The ...

A uniform structure for multivariate data constructs that employs the nested array features of APL2 has been successfully developed and implemented. This Array Canonical Form (ACF) succinctly describes its own contents, an important feature for the APL2 ...

This paper describes an extension to the system of parity logic operations developed by Gerard Langlet and subsequently elaborated by Michael Zaus. Two operations, A and B, are introduced which can be used both to analyze and to synthesize arbitrary ...

This paper considers the problem of classification tree based data analysis. Among the topics discussed in the paper are: growing a classification tree using CART style exhaustive search for splits, selecting the right size for the tree using minimal ...

Today, PSE emerges as a promising approach for providing programmers with high-level abstract functions Particularly for numerical programs which essentially handle large arrays, abstract representation of array-handling functions is very important. ...

Based on the seven levels of principals of object-oriented programming described by B. Meyer [2], it is shown that with today's APL interpreters it is possible to combine array processing and object-oriented programming on a very high level of ...

Fundamentals of graph coloring are introduced, and four basic alternative algorithms for coloring undirected graphs are described in J, along with programs for generating, adjacency matrices and testing them. Results are compared, and suggestions for ...

Tcl stands for Tool Command Language. It is a script language, but unlike the well-known perl, it is also an extensible interpreter that is designed to be easily embedded into other applications. The Tcl source code is available from the Internet and ...

This paper describes ADAGE, (A Dynamic APL GUI Equation solver), which allows the user to solve a single multivariate equation when values are supplied for all but one of the variables. The application presents a graphical user interface and uses many ...

The fundamental, data structure in APL is the array. Arrays are, in most APL dialects, the only data structure, from scalars as arrays with no dimensions to the complex structures of nested arrays. But there are other ways in which array concepts could ...

A method of replacing an explicit loop by the "each" operator was studied. The repetitive, computational part of the loop was extracted into a function FOO. Then, the function was applied to each value of the loop counter vector C (FOO "each" C). Since ...

Among the main impediments that languages such as MATLAB and APL present to a compiler is the lack of an explicit declaration for a variable's type, The determination of this important attribute could allow a compiler to generate more efficient code, ...