5 floating point Bessel's function of
6 the first and second kinds and of
13 returns the value of Jn(x) for all
14 integer values of n and all real values
17 There are no error returns.
20 For n=0, j0(x) is called,
21 for n=1, j1(x) is called,
22 for n<x, forward recursion us used starting
23 from values of j0(x) and j1(x).
24 for n>x, a continued fraction approximation to
25 j(n,x)/j(n-1,x) is evaluated and then backward
26 recursion is used starting from a supposed value
27 for j(n,x). The resulting value of j(0,x) is
28 compared with the actual value to correct the
29 supposed value of j(n,x).
31 yn(n,x) is similar in all respects, except
32 that forward recursion is used for all
72 for(t=0,i=n+16; i>n; i--)
78 for(i=n-1; i>0; i--) {