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man pages->OpenBSD man pages -> j1 (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
```

### 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() and j1() compute the Bessel function of
the first kind
of the order 0 and the order 1, respectively, for  the  real
value x; the
function jn() computes the Bessel function of the first kind
of the
integer Bessel0 n for  the  real  value  x.   The  functions
j0f(), j1f(), and
jnf() are single precision versions of j0(), j1(), and jn(),
respectively.

The functions y0() and y1() compute the linearly independent
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 function
yn() computes the Bessel function of the second kind for the
integer
Bessel0 n for the positive integer value x (expressed  as  a
double).  The
functions  y0f(), y1f(), and ynf() are single precision versions of y0(),
y1(), and yn(), respectively.
```

### RETURN VALUES[Toc][Back]

```     If these functions are successful, the computed value is returned, otherwise
the global variable errno is set to EDOM or ERANGE.
```

```     math(3)
```

### HISTORY[Toc][Back]

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

OpenBSD      3.6                          April      19,     1991
```
[ Back ]
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