y0, y1, yn - Bessel functions of the second kind
#include <math.h> double y0(double x); double y1 (double x); double yn (int n, double x);
The y0(), y1() and yn() functions compute Bessel functions of x of the second kind of orders 0, 1 and n respectively. The value of x must be positive.An application wishing to check for error situations should set errno to 0 before calling y0(), y1() or yn(). If errno is non-zero on return, or the return value is NaN, an error has occurred.
Upon successful completion, y0(), y1() and yn() will return the relevant Bessel value of x of the second kind.If x is NaN, NaN is returned and errno may be set to [EDOM].
If the x argument to y0(), y1() or yn() is negative, -HUGE_VAL or NaN is returned, and errno may be set to [EDOM].
If x is 0.0, -HUGE_VAL is returned and errno may be set to [ERANGE] or [EDOM].
If the correct result would cause underflow, 0.0 is returned and errno may be set to [ERANGE].
If the correct result would cause overflow, -HUGE_VAL or 0.0 is returned and errno may be set to [ERANGE].
The y0(), y1() and yn() functions may fail if:
- [EDOM]
- The value of x is negative or NaN.
- [ERANGE]
- The value of x is too large in magnitude, or x is 0.0, or the correct result would cause overflow or underflow.
No other errors will occur.
None.
None.
None.
isnan(), j0(), <math.h>.
Derived from Issue 1 of the SVID.