HP-UX Reference (11i v3 07/02) - 3 Library Functions A-M (vol 6)

j0(3M) j0(3M)

NAME

j0(), j0f(), j1(), j1f(), jn( ), jnf( ) - Bessel functions of the ﬁrst kind

SYNOPSIS

#include <math.h>

double j0(double x);

double j1(double x);

double jn(int n, double x);

HP Integrity Server Only

float j0f(float x);

float j1f(float x);

float jnf(int n, float x);

DESCRIPTION

j0() and j1() return Bessel functions of x of the ﬁrst kind of orders 0 and 1 respectively.

jn() returns

the Bessel function of x of the ﬁrst kind of order n.

j0f(), j1f(), and jnf() are float versions of j0(), j1(), snd jn(); each takes a

float argu-

ment x and returns a

float result.

USAGE

To use these functions, compile either with the default -Ae option or with the -Aa

and

-D_HPUX_SOURCE options. Make sure your program includes

<math.h>. Link in the math library by

specifying

-lm on the compiler or linker command line.

RETURN VALUE

If x is NaN, j0(), j1(), and jn() return NaN.

ERRORS

No errors are deﬁned.