NAME

SYNOPSIS

DESCRIPTION

RETURN VALUE

ERRORS

ATTRIBUTES

CONFORMING TO

BUGS

SEE ALSO

COLOPHON

## NAME

## SYNOPSIS

## DESCRIPTION

## RETURN VALUE

## ERRORS

## ATTRIBUTES

## CONFORMING TO

## BUGS

## SEE ALSO

## COLOPHON

SYNOPSIS

DESCRIPTION

RETURN VALUE

ERRORS

ATTRIBUTES

CONFORMING TO

BUGS

SEE ALSO

COLOPHON

y0, y0f, y0l, y1, y1f, y1l, yn, ynf, ynl − Bessel functions of the second kind

**#include
<math.h>**

**double
y0(double** *x***);
double y1(double**

double yn(int

**float
y0f(float** *x***);
float y1f(float**

float ynf(int

**long double
y0l(long double** *x***);
long double y1l(long double**

long double ynl(int

Link with
*−lm*.

Feature Test
Macro Requirements for glibc (see
**feature_test_macros**(7)):

**y0**(),
**y1**(), **yn**():

_SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE

**y0f**(), **y0l**(),
**y1f**(), **y1l**(), **ynf**(), **ynl**():

_SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE >= 600

The **y0**()
and **y1**() functions return Bessel functions of
*x* of the second kind of orders 0 and 1, respectively.
The **yn**() function returns the Bessel function of
*x* of the second kind of order *n*.

The value of
*x* must be positive.

The
**y0f**(), **y1f**(), and **ynf**() functions are
versions that take and return *float* values. The
**y0l**(), **y1l**(), and **ynl**() functions are
versions that take and return *long double* values.

On success,
these functions return the appropriate Bessel value of the
second kind for *x*.

If *x* is
a NaN, a NaN is returned.

If *x* is
negative, a domain error occurs, and the functions return
-**HUGE_VAL**, -**HUGE_VALF**, or -**HUGE_VALL**,
respectively. (POSIX.1-2001 also allows a NaN return for
this case.)

If *x* is
0.0, a pole error occurs, and the functions return
-**HUGE_VAL**, -**HUGE_VALF**, or -**HUGE_VALL**,
respectively.

If the result underflows, a range error occurs, and the functions return 0.0

If the result
overflows, a range error occurs, and the functions return
-**HUGE_VAL**, -**HUGE_VALF**, or -**HUGE_VALL**,
respectively. (POSIX.1-2001 also allows a 0.0 return for
this case.)

See
**math_error**(7) for information on how to determine
whether an error has occurred when calling these
functions.

The following
errors can occur:

Domain error: *x* is negative

*errno* is set to
**EDOM**. An invalid floating-point exception
(**FE_INVALID**) is raised.

Pole error: *x* is 0.0

*errno* is set to
**ERANGE** (but see BUGS). No **FE_DIVBYZERO**
exception is returned by **fetestexcept**(3) for this
case.

Range error: result underflow

*errno* is set to
**ERANGE**. No **FE_UNDERFLOW** exception is returned
by **fetestexcept**(3) for this case.

Range error: result overflow

*errno* is not set for
this case. An overflow floating-point exception
(**FE_OVERFLOW**) is raised.

For an
explanation of the terms used in this section, see
**attributes**(7).

The functions
returning *double* conform to SVr4, 4.3BSD,
POSIX.1-2001, POSIX.1-2008. The others are nonstandard
functions that also exist on the BSDs.

On a pole
error, these functions set *errno* to **EDOM**,
instead of **ERANGE** as POSIX.1-2004 requires.

In glibc
version 2.3.2 and earlier, these functions do not raise an
invalid floating-point exception (**FE_INVALID**) when a
domain error occurs.

**j0**(3)

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