*Compute a Bessel function of the second kind*

#include <math.h> double yn( intn, doublex); float ynf( intn, floatx);

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

Compute the Bessel function of the second kind for `n` and
`x`.

The result of the Bessel function of `n` and `x`.

Note:
If an error occurs, these functions return 0, but this is also a valid
mathematical result.
If you want to check for errors, set
`errno`
to 0, call the function, and then check `errno` again.
These functions don't change `errno` if no errors occurred.

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

Safety: | |
---|---|

Cancellation point | No |

Interrupt handler | No |

Signal handler | No |

Thread | Yes |