Compute a Bessel function of the second kind of a given order
#include <math.h> double yn( int n, double x ); float ynf( int n, float x );
These functions compute the Bessel function for x of the second kind of order n.
To check for error situations, use feclearexcept() and fetestexcept(). For example:
The result of the Bessel function for x of the second kind of order n.
If x is: | These functions return: | Errors: |
---|---|---|
Negative, including -Inf | NaN | FE_INVALID |
0.0 | -Inf | FE_DIVBYZERO |
NaN | NaN | — |
Inf | 0.0 | — |
If the correct result would cause: | These functions return: | Errors: |
---|---|---|
Overflow | -Inf | FE_OVERFLOW |
Underflow | 0.0 |
These functions raise FE_INEXACT if the FPU reports that the result can't be exactly represented as a floating-point number.
yn() is POSIX 1003.1 XSI; ynf() is Unix
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | No |
Thread | Yes |