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. 

  —  Math Libraries