yn(), ynf()

Updated: May 06, 2022

Compute a Bessel function of the second kind of a given order

Synopsis:

#include <math.h>

double yn( int n, 
           double x );

float ynf( int n, 
           float x );

Arguments:

n, x
The numbers that you want to compute the Bessel function for.

Library:

libm
The general-purpose math library.
libm-sve
(QNX Neutrino 7.1 or later) A library that optimizes the code for ARMv8.2 chips that have Scalable Vector Extension hardware.

Your system requirements will determine how you should work with these libraries:

Note: Compile your program with the -fno-builtin option to prevent the compiler from using a built-in version of the function.

Description:

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:

Returns:

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.

Classification:

yn() is POSIX 1003.1 XSI; ynf() is Unix

Safety:  
Cancellation point No
Interrupt handler Yes
Signal handler Yes
Thread Yes