BESSEL(3M)
NAME
j0, j1, jn, y0, y1, yn − Bessel functions
SYNOPSIS
#include <math.h>
double j0 (x)
double x;
double j1 (x)
double x;
double jn (n, x)
int n;
double x;
double y0 (x)
double x;
double y1 (x)
double x;
double yn (n, x)
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 the 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.
ERRORS
Series 300
Non-positive arguments cause y0, y1 and yn to return the value −HUGE_VAL and to set errno to EDOM. They also cause a message indicating DOMAIN error to be printed on the standard error output. Arguments too large in magnitude cause j0, j1, jn, y0, y1 , and yn to return 0.0 and set errno to ERANGE. In addition, a message indicating TLOSS error is printed on the standard error output.
Series 800 (/lib/libm.a)
Non-positive arguments cause y0, y1 , and yn to return the value −HUGE_VAL and to set errno to EDOM. They also cause a message indicating DOMAIN error to be printed on the standard error output.
Arguments too large in magnitude cause j0, j1, jn, y0, y1 , and yn to return 0.0 and set errno to ERANGE. In addition, a message indicating TLOSS error is printed on the standard error output.
j0, j1, jn, y0, y1 , and yn return NaN and set errno to EDOM when x is NaN or ±INFINITY . In addition, a message indicating DOMAIN error is printed on the standard error output.
Series 800 (ANSI C /lib/libM.a)
No error messages are printed on the standard error output.
Non-positive arguments cause y0, y1 , and yn to return the value NaN and to set errno to EDOM. IP Arguments too large in magnitude cause j0, j1, jn, y0, y1 , and yn to return 0.0 and set errno to ERANGE.
j0, j1, jn, y0, y1 , and yn return NaN and set errno to EDOM when x is NaN or ±INFINITY .
These error-handling procedures can be changed with the function matherr(3M).
SEE ALSO
isinf(3M), isnan(3M), matherr(3M).
STANDARDS CONFORMANCE
j0: SVID2, XPG2, XPG3
j1: SVID2, XPG2, XPG3
jn: SVID2, XPG2, XPG3
y0: SVID2, XPG2, XPG3
y1: SVID2, XPG2, XPG3
yn: SVID2, XPG2, XPG3
Hewlett-Packard Company — HP-UX Release 7.0: Sept 1989