Initializing help system before first use

# PWL

Purpose
The piecewise linear function
Synopsis
`PWL( variable, x1, y1, ..., xk, yk )`
Arguments

variable | is a single variable that describes where the pwl shold be evaluated.
x1,y2, ..., xk, yk | are the k breakpoints of the piecewise linear function. The pwl is extended to minus and plus infinity using the first and last 2 breakpoints respectively.

Parent Topic Other mathematical functions

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