BESSEL(3M)							    BESSEL(3M)

NAME    [Toc]    [Back]

     j0, j1, jn, y0, y1, yn, j0l, j1l, jnl, y0l, y1l, ynl - bessel functions

SYNOPSIS    [Toc]    [Back]

     #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);

     long double j0l(long double x);

     long double j1l(long double x);

     long double jnl(int n, long double	x);

     long double y0l(long double x);

     long double y1l(long double x);

     long double ynl(int n, long double	x);

DESCRIPTION    [Toc]    [Back]

     j0	and j1 return Bessel functions of x of the first kind of orders	zero
     and one, respectively.  jn	returns	the Bessel function of x of the	first
     kind of order n.  j0l, j1l, and jnl are the long double versions of these
     functions.

     y0	and y1 return Bessel functions of x of the second kind of orders zero
     and one, respectively.  yn	returns	the Bessel function of x of the	second
     kind of order n.  The value of x must be positive.	 y0l, y1l, and ynl are
     the long double versions of these functions.

DIAGNOSTICS    [Toc]    [Back]

     In	the diagnostics	below, functions in the	standard math library libm.a,
     are referred to as	-lm versions, those in math library libmx.a are
     referred to as -lmx versions, and those in	the the	BSD math library
     libm43.a are referred to as -lm43 versions.  The -lm and -lmx versions
     always return the default Quiet NaN and set errno to EDOM when a NaN is
     used as an	argument.  A NaN argument usually causes the -lm43 versions to
     return the	same argument.	The -lm43 versions never set errno.






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BESSEL(3M)							    BESSEL(3M)



     The value of HUGE_VAL is IEEE Infinity.

     If	the value of x is zero,	y0, y1 and yn return the value -HUGE_VAL.  The
     -lm and -lmx versions also	set errno to ERANGE.

     Negative values of	x cause	y0, y1 and yn to return	the default quiet NaN.
     The -lm and -lmx versions also set	errno to EDOM.

     Values of x too large cause y0, y1	and yn to return zero.	The -lm	and
     -lmx versions also	set errno to ERANGE.

     Values of x too large in magnitude	cause j0, j1 and jn to return zero.
     The -lm and -lmx versions also set	errno to ERANGE.

SEE ALSO    [Toc]    [Back]

     math(3M), matherr(3M)


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