cc [ flags ] -I/usr/local/include file(s) -L/usr/local/lib -lmcw [ ... ] #include <mathcw.h> extern float binf (int n, float x); extern double bin (int n, double x); extern long double binl (int n, long double x); extern __float80 binw (int n, __float80 x); extern __float128 binq (int n, __float128 x); extern long_long_double binll (int n, long_long_double x); extern decimal_float bindf (int n, decimal_float x); extern decimal_double bind (int n, decimal_double x); extern decimal_long_double bindl (int n, decimal_long_double x); extern decimal_long_long_double bindll (int n, decimal_long_long_double x);
NB: Functions with prototypes containing underscores in type names may be available only with certain extended compilers.
The modified Bessel functions provided by these software implementations are defined according to Chapter 9, Bessel Functions of Integer Order, of the Handbook of Mathematical Functions, edited by Milton Abramowitz and Irene A. Stegun, National Bureau of Standards Applied Mathematics Series #55, US Department of Commerce, Washington, DC (1964).
The I(n,x) functions grow exponentially with increasing x, and overflow even with moderate x values. For that reason, there is a related family of functions that return values of this Bessel function reduced by a factor of exp(-x); see bisn(3CW).