bessel(3M)                                                       bessel(3M)

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

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

RESULT
     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.

     In the K&R mode, (cc -kcc), these error-handling procedures may be
     changed with the function matherr(). In the ANSI mode, (cc -kansi),
     HUGEVAL is returned instead of HUGE and no error messages are
     printed.

SEE ALSO
     isnan(3C), matherr(3M), math(5).












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