This method builds an instance of piecewise linear function defined everywhere. The array point contains the n breakpoints of the function such that point [i-1] <= point [i] for i = 1, . . ., n-1. The array slope contains the n+1 slopes of the n+1 segments of the function. The values a and fa must be coordinates of a point such that fa = f(a).

This method builds an instance of piecewise linear function defined everywhere.