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man pages->Linux man pages -> j0 (3)
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## J0(3)

```
```

### NAME[Toc][Back]

```       j0, j1, jn, y0, y1, yn - Bessel functions
```

### SYNOPSIS[Toc][Back]

```       #include <math.h>

double j0(double x);

double j1(double x);

double jn(int n, double x);

double y0(double x);

double y1(double x);

double yn(int n, double x);
```

### DESCRIPTION[Toc][Back]

```       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  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.

For the functions y0(), y1() and yn(), the value of x must be positive.
For negative values of x, these functions return -HUGE_VAL.
```

### CONFORMING TO[Toc][Back]

```       SVID 3, BSD 4.3
```

### BUGS[Toc][Back]

```       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.

1993-06-26				 J0(3)
```
[ Back ]
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