apl APL a Day #7: Scalar Functions Scalar functions perform most of the hard labor in an APL program. A scalar function defines a mapping from one or two scalar values to a third value. In math, the addition function
apl APL a Day #6: Indices and Encoding Previous sessions established a basic conception of indexing an array. Namely, an index encodes a reference to an element in an array according to the position of the element along each of its
apl APL a Day #5: Indexing into Arrays By now, clearly a shape and vector of values precisely determines an array. All APL functions operate over arrays; they describe new arrays in terms of its arguments. What about describing a sub-array
apl APL a Day #4: Arrays have elements An array that only describes a box which may contain elements, but that does not contain any elements, does not mean much. While shapes help to clarify the APL language, when doing any
apl APL a Day #3: Arrays have Shape Arrays arrange data into a certain rectangular shape. In APL, the shape of an array is a vector --- yes, in APL, shapes are also arrays --- that describes the number and size
apl APL a Day #2: Arrays, Values Last session belabored the function, it's relation to APL, and how APL's treatment of functions differs from traditional mathematics. Keep functions in mind: they come first for a reason. All future sessions will
apl APL a Day #1: Functions In early grade school mathematics, students already learn the concept of a function, but they do not know what they are called. An expression like 5+5 uses the function known as addition.
apl APL a Day #0: Introduction The APL community seems ripe for a quick, simple, accessible daily series on APL, and here it is. What better time to start than the coming new year? Each session presents a small