# MirBSD manpage: j0(3), j0f(3), j1(3), j1f(3), jn(3), jnf(3), y0(3), y0f(3), y1(3), y1f(3), yn(3), ynf(3)

```J0(3)                      BSD Programmer's Manual                       J0(3)
```

## NAME

```     j0, j0f, j1, j1f, jn, jnf, y0, y0f, y1, y1f, yn, ynf - Bessel functions
of first and second kind
```

## LIBRARY

```     libm
```

## SYNOPSIS

```     #include <math.h>

double
j0(double x);

float
j0f(float x);

double
j1(double x);

float
j1f(float x);

double
jn(int n, double x);

float
jnf(int n, float x);

double
y0(double x);

float
y0f(float x);

double
y1(double x);

float
y1f(float x);

double
yn(int n, double x);

float
ynf(int n, float x);
```

## DESCRIPTION

```     The functions j0(), j0f(), j1() and j1f() compute the Bessel function of
the first kind of the order 0 and the order 1, respectively, for the real
value x; the functions jn() and jnf() compute the Bessel function of the
first kind of the integer n for the real value x.

The functions y0(), y0f(), y1() and y1f() compute the linearly indepen-
dent Bessel function of the second kind of the order 0 and the order 1,
respectively, for the positive integer value x (expressed as a double);
the functions yn() and ynf() compute the Bessel function of the second
kind for the integer n for the positive integer value x (expressed as a
double).
```

## RETURN VALUES

```     If these functions are successful, the computed value is returned, other-
wise the global variable errno is set to EDOM and a reserve operand fault
is generated.
```

```     math(3)
```

## HISTORY

```     This set of functions appeared in Version 7 AT&T UNIX.

MirBSD #10-current              April 19, 1991                               1```

Generated on 2022-12-24 01:00:14 by \$MirOS: src/scripts/roff2htm,v 1.113 2022/12/21 23:14:31 tg Exp \$ — This product includes material provided by mirabilos.

These manual pages and other documentation are copyrighted by their respective writers; their sources are available at the project’s CVSweb, AnonCVS and other mirrors. The rest is Copyright © 2002–2022 MirBSD.

This manual page’s HTML representation is supposed to be valid XHTML/1.1; if not, please send a bug report — diffs preferred.

Kontakt / Impressum & Datenschutzerklärung