HP-UX Reference (11i v2 07/12) - 3 Library Functions N-Z (vol 7)

y
y0(3M) y0(3M)
NAME
y0(), y0f(), y0l(), y0w(), y0q(), y1(), y1f(), y1l(), y1w(), y1q(), yn(), ynf(), ynl(), ynw(), ynq() - Bessel functions
of the second kind
SYNOPSIS
#include <math.h>
double y0(double
x);
double y1(double
x);
double yn(int
n, double x);
HP Integrity Server Only
float y0f(float x);
float y1f(float
x);
float ynf(int
n, float x);
long double y0l(long double
x);
long double y1l(long double
x);
long double ynl(int
n, long double x);
extended y0w(extended
x);
extended y1w(extended
x);
extended ynw(int
n, extended x);
quad y0q(quad
x);
quad y1q(quad
x);
quad ynq(int
n, quad x);
DESCRIPTION
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.
y0f(), y1f(), and ynf() are float versions of y0(), y1(), snd yn(); each takes a
float argu-
ment x and returns a
float result.
y0l(), y1l(), and ynl() are long double versions of y0(), y1(), and
yn(); each takes a long
double
arguement x and returns a long double result.
y0w(), y1w(), and ynw() are extended version of y0(), y1(), and yn()
; each takes an
extended argument x and resturns an extended result.
y0q(), y1q(), and ynq() are quad version of y0(), y1(), and yn()
; each takes a quad argument
x and returns a
quad result.
USAGE
To use these functions, compile either with the default -Ae option or with the -Aa and
-D_HPUX_SOURCE options. Make sure your program includes <math.h>. Link in the math library by
specifying -lm on the compiler or linker command line.
To use (for Integrity servers) y0w(), y1w(), ynw(), y0q(), y1q(),orynq(), compile also with the
-fpwidetypes option.
RETURN VALUE
If x is negative or zero, y0(), y1(), and yn() return −HUGE_VAL (equal to −INFINITY).
If x is NaN, y0(), y1(), and yn() return NaN.
If the correct result would overflow, y0(), y1(), and yn() return −HUGE_VAL.
ERRORS
No errors are defined.
654 Hewlett-Packard Company − 1 − HP-UX 11i Version 2: December 2007 Update