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J0(3)			    BSD Programmer's Manual			 J0(3)

NAME
     j0, j0f, j1, j1f, jn, jnf, y0, y0f, y1, y1f, yn, ynf - Bessel functions
     of first and second kind

SYNOPSIS
     #include <math.h>

     double
     j0(double x);

     float
     j0f(float x);

     double
     j1(double x);

     float
     j1f(float x);

     double
     jn(int n, double x);

     float
     jnf(int n, float x);

     double
     y0(double x);

     float
     y0f(float x);

     double
     y1(double x);

     float
     y1f(float x);

     double
     yn(int n, double x);

     float
     ynf(int n, float x);

DESCRIPTION
     The functions j0(), j0f(), j1() and j1f() compute the Bessel function of
     the first kind of the order 0 and the order 1, respectively, for the real
     value x; the functions jn() and jnf() compute the Bessel function of the
     first kind of the integer order n for the real value x.

     The functions y0(), y0f(), y1(), and y1f() compute the linearly indepen-
     dent Bessel function of the second kind of the order 0 and the order 1,
     respectively, for the positive real value x; the functions yn() and ynf()
     compute the Bessel function of the second kind for the integer order n
     for the positive real value x.

ERRORS
     For y0(), y0f(), y1(), y1f(), yn(), or ynf(), if x <= 0 then:

     _IEEE_    The return value is -Inf if x = 0, or NaN if x < 0.
     _POSIX_   The return value is -Inf, and errno is set to EDOM.
     _XOPEN_   Same as _POSIX_, but errno is only set if matherr(3) returns 0.

	       The exception type is DOMAIN.
     _SVID_    Same as _XOPEN_, but the return value is -MAXFLOAT, and a mes-
	       sage is printed to stderr if errno is set.

     If the magnitude of x would lead to a result with a total loss of signif-
     icance, then:

     _IEEE_    The return value is 0.
     _POSIX_   Same as _IEEE_, but errno is also set to ERANGE.
     _XOPEN_   Same as _POSIX_, but errno is only set if matherr(3) returns 0.
	       The exception type is TLOSS.
     _SVID_    Same as _XOPEN_, and a message is printed to stderr if errno is
	       set.

SEE ALSO
     math(3)

HISTORY
     This set of functions appeared in Version 7 AT&T UNIX.

4th Berkeley Distribution      February 17, 1998			     2
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