NAME

bessel: j0, j1, jn, y0, y1, yn - Bessel functions

SYNOPSIS

cc [flag ...] file ...  -lm [library ...]

#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

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.

y0 and y1 return Bessel functions of x of the second kind of orders 0 and 1, respectively. yn returns the Bessel function of x of the second kind of order n. The value of x must be positive.

SEE ALSO

matherr(3M).

DIAGNOSTICS

Non-positive arguments cause y0, y1, and yn to return the value -HUGE and to set errno to EDOM. In addition, a message indicating DOMAIN error is printed on the standard error output.

Arguments too large in magnitude cause j0, j1, y0, and y1 to return 0 and to set errno to ERANGE. In addition, a message indicating TLOSS error is printed on the standard error output.

Except when the -Xc compilation option is used, these error-handling procedures may be changed with the function matherr. When the -Xa or -Xc compilation options are used, HUGE_VAL is returned instead of HUGE and no error messages are printed.