The Function Approximation library element provides a vectorized linear approximation of a function, f(x), for a given input data, x, using a configured lookup table of slope and offset values that describe the function. Utility functions which create the approximation lookup tables are provided for a number of frequently used functions such as sqrt(), invsqrt(), log(), exp() and inv(). The Function Approximation can also be provided with user-created lookup tables, provided they meet the requirements specified in the section below, Configuring the Lookup Table.