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man pages->FreeBSD man pages -> ynf (3)
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## J0(3)

```
```

### NAME[Toc][Back]

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

### LIBRARY[Toc][Back]

```     Math Library (libm, -lm)
```

### SYNOPSIS[Toc][Back]

```     #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[Toc][Back]

```     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 order n for the real value x.

The functions y0(), y0f(), y1(), and y1f() compute the linearly independent
Bessel function of the second kind of the order 0 and the order 1,
respectively, for the positive real value x; the functions yn() and ynf()
compute the Bessel function of the second kind for the integer order n
for the positive real value x.
```

### RETURN VALUES[Toc][Back]

```     If these functions are successful, the computed value is returned.  On
the VAX and Tahoe architectures, for the Bessel functions of the second
kind, a negative or zero x value results in an error; the global variable
errno is set to EDOM and a reserve operand fault is generated.
```

```     math(3)
```

### HISTORY[Toc][Back]

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

FreeBSD 5.2.1			April 19, 1991			 FreeBSD 5.2.1```
[ Back ]
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