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

j0, j0f, j0l, j1, j1f, j1l, jn, jnf, jnl − Bessel functions of the first kind

**#include
<math.h>**

**double
j0(double** *x***);
double j1(double**

double jn(int

**float
j0f(float** *x***);
float j1f(float**

float jnf(int

**long double
j0l(long double** *x***);
long double j1l(long double**

long double jnl(int

Link with
*−lm*.

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

**j0**(),
**j1**(), **jn**():

_SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE

**j0f**(), **j0l**(),
**j1f**(), **j1l**(), **jnf**(), **jnl**():

_SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE >= 600

The **j0**()
and **j1**() functions return Bessel functions of
*x* of the first kind of orders 0 and 1, respectively.
The **jn**() function returns the Bessel function of
*x* of the first kind of order *n*.

The
**j0f**(), **j1f**(), and **jnf**(), functions are
versions that take and return *float* values. The
**j0l**(), **j1l**(), and **jnl**() functions are
versions that take and return *long double* values.

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

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

If *x* is
too large in magnitude, or the result underflows, a range
error occurs, and the return value is 0.

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

The following
errors can occur:

Range error: result underflow, or *x* is too large in
magnitude

*errno* is set to
**ERANGE**.

These functions
do not raise exceptions for **fetestexcept**(3).

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, and POSIX.1-2008. The others are nonstandard
functions that also exist on the BSDs.

There are
errors of up to 2e−16 in the values returned by
**j0**(), **j1**() and **jn**() for values of
*x* between −8 and 8.

**y0**(3)

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