Scalar functions
ACM SIGAPL APL Quote Quad · 1983
The primitive functions described in this section are called scalar-functions. All scalar-functions have uniform behaviour with respect to the structure of their argument arrays. The shape of the result of a scalar-function is determined solely by the shapes of its arguments.This section defines scalar-functions individually for scalar arguments. Their common behaviour is described here by the expository device of an implicit operator, called the scalar-extension-operator.