[fun_value,ifail] = s18acf(x<,ifail>)
This routine evaluates an approximation to the modified Bessel Function of the second kind K (x). 0 Note: K (x) is undefined for x<=0 and the routine will fail for 0 such arguments.
s18acf Required Input Arguments: x real Optional Input Arguments: <Default> ifail integer -1 Output Arguments: ifail integer