AIRY - Approximate the Airy functions Ai(x), Bi(x) and their respective
derivatives Ai'(x), Bi'(x)
airya return approximation of Ai(x)
airypa return approximation of Ai'(x)
airyb return approximation of Bi(x)
airybp return approximation of Bi'(x)
Function Prototypes:
float airya (float x);
float airyap (float x);
float airyb (float x);
float airybp (float x);
Input:
x value at which to evaluate Ai(x)
Returned:
airya Ai(x)
airypa Ai'(x)
airyb Bi(x)
airybp Bi'(x)
Reference:
The approximation is derived from tables and formulas in Abramowitz
and Stegun, p. 475-477.
Author: Dave Hale, Colorado School of Mines, 06/06/89