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An introduction to APL for an experienced practitioner from a different programming language or two. We all learn in different ways, and I prefer the fundamental concepts laid bare first, and then learn by example.
- Split Text by Delimiter
- Indices of Multiple Elements
- Frequency of Characters in A String
- Parenthesis Nesting Level
- Grille Cypher
≠ gives 1 for true and 0 for false. It pairs upa single element argument with all the elements of the other arguments: ⊢returns its right argument: ⊆returns a list of runs as indicated by runs of 1s, leaving out elements indicated by 0s: We use the comparison vector to partitionthe right argument: Try it now! Notice that you can read the tacit func...
∊gives us a mask for elements (characters) in the left argument that are members of the right argument: ⍸gives us the indices where true (1): We can combine this into an anonymous infix (dyadic) function:
The Outer Productallows for an intuitive way to compute the occurrence of characters at a given location in a string: Then it is simply a matter of performing a sum-reduce +/to calculate the total frequency of each character:
What was the one-liner for the nesting level of parentheses? It would take a bit of work to figure out, because at the time of the meeting Perlis described, no APL implementation existed. Two possibilities are explained here.
A grilleis a 500 year old method for encrypting messages. Represent both the grid of letters and the grille as character matrices. Retrieve elements of the grid where there are spaces in the grille. An alternative method using ravel.
TryAPL. Got a minute? — Try APL! APL is an array-oriented programming language that will change the way you think about problems and data. With a powerful, concise syntax, it lets you develop shorter programs that enable you to think more about the problem you're trying to solve than how to express it to a computer.
APL (named after the book A Programming Language) is a programming language developed in the 1960s by Kenneth E. Iverson. Its central datatype is the multidimensional array. It uses a large range of special graphic symbols to represent most functions and operators, leading to very concise code.
Oct 10, 2012 · Now programs could be both typed in and printed. Here, for example, is the printed version a program from the APL Language manual 2 that computes the mathematical determinant of a matrix: A Taste of APL. APL is a concise high-level programming language that differs from most others developed in the 1960s in several respects:
The programming language APL is distinctive in being symbolic rather than lexical: its primitives are denoted by symbols, not words. These symbols were originally devised as a mathematical notation to describe algorithms.
The material in this tutorial will work with any version of APLX, including Windows, Macintosh and Linux desktop versions. The screen shots are taken from APLX running on Windows, but you should find the Macintosh and Linux versions very similar. Most of the material in this tutorial applies to any dialect of APL.
