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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | CONFORMING TO | BUGS | SEE ALSO | COLOPHON |
Y0(3) Linux Programmer's Manual Y0(3)
y0, y0f, y0l, y1, y1f, y1l, yn, ynf, ynl - Bessel functions of the
second kind
#include <math.h>
double y0(double x);
double y1(double x);
double yn(int n, double x);
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);
Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
y0(), y1(), yn():
_XOPEN_SOURCE
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
y0f(), y0l(), y1f(), y1l(), ynf(), ynl():
_XOPEN_SOURCE >= 600
|| (_ISOC99_SOURCE && _XOPEN_SOURCE)
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
The y0() and y1() functions return Bessel functions of x of the
second kind of orders 0 and 1, respectively. The yn() function
returns the Bessel function of x of the second kind of order n.
The value of x must be positive.
The y0f(), y1f(), and ynf() functions are versions that take and
return float values. The y0l(), y1l(), and ynl() functions are
versions that take and return long double values.
On success, these functions return the appropriate Bessel value of
the second kind for x.
If x is a NaN, a NaN is returned.
If x is negative, a domain error occurs, and the functions return
-HUGE_VAL, -HUGE_VALF, or -HUGE_VALL, respectively. (POSIX.1-2001
also allows a NaN return for this case.)
If x is 0.0, a pole error occurs, and the functions return -HUGE_VAL,
-HUGE_VALF, or -HUGE_VALL, respectively.
If the result underflows, a range error occurs, and the functions
return 0.0
If the result overflows, a range error occurs, and the functions
return -HUGE_VAL, -HUGE_VALF, or -HUGE_VALL, respectively.
(POSIX.1-2001 also allows a 0.0 return for this case.)
See math_error(7) for information on how to determine whether an
error has occurred when calling these functions.
The following errors can occur:
Domain error: x is negative
errno is set to EDOM. An invalid floating-point exception
(FE_INVALID) is raised.
Pole error: x is 0.0
errno is set to ERANGE (but see BUGS). No FE_DIVBYZERO
exception is returned by fetestexcept(3) for this case.
Range error: result underflow
errno is set to ERANGE. No FE_UNDERFLOW exception is returned
by fetestexcept(3) for this case.
Range error: result overflow
errno is not set for this case. An overflow floating-point
exception (FE_OVERFLOW) is raised.
For an explanation of the terms used in this section, see
attributes(7).
┌───────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├───────────────────┼───────────────┼─────────┤
│y0(), y0f(), y0l() │ Thread safety │ MT-Safe │
├───────────────────┼───────────────┼─────────┤
│y1(), y1f(), y1l() │ Thread safety │ MT-Safe │
├───────────────────┼───────────────┼─────────┤
│yn(), ynf(), ynl() │ Thread safety │ MT-Safe │
└───────────────────┴───────────────┴─────────┘
The functions returning double conform to SVr4, 4.3BSD, POSIX.1-2001,
POSIX.1-2008. The others are nonstandard functions that also exist
on the BSDs.
On a pole error, these functions set errno to EDOM, instead of ERANGE
as POSIX.1-2004 requires.
In glibc version 2.3.2 and earlier, these functions do not raise an
invalid floating-point exception (FE_INVALID) when a domain error
occurs.
j0(3)
This page is part of release 4.12 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
2016-03-15 Y0(3)
Pages that refer to this page: j0(3)