HP-UX Reference (11i v3 07/02) - 3 Library Functions N-Z (vol 7)

y
y0(3M) y0(3M)
NAME
y0(), y0f(), y1(), y1f(), yn(), ynf() - 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);
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.
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.
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.
SEE ALSO
j0(3M), math(5).
Handbook of Mathematical Functions, M. Abramowitz and I. Stegun, (New York: Dover Publications, 1972).
STANDARDS CONFORMANCE
y0(): SVID3, XPG4.2
y1(): SVID3, XPG4.2
yn(): SVID3, XPG4.2
676 Hewlett-Packard Company − 1 − HP-UX 11i Version 3: February 2007