PSPP functions provide mathematical abilities above and beyond those possible using simple operators. Functions have a common syntax: each is composed of a function name followed by a left parenthesis, one or more arguments, and a right parenthesis.
Function names are not reserved. Their names are specially treated
only when followed by a left parenthesis, so that
refers to the constant value
e raised to the 10th power, but
EXP by itself refers to the value of variable EXP.
The sections below describe each function in detail.