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 #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.