y1(3M)
NAME
y0, y1, yn - Bessel functions of the second kind
SYNOPSIS
cc [ flag ... ] file ... -lm [ library ... ]
double y0(double x);
double y1(double x);
double yn(int n, double x);
DESCRIPTION
The y0(), y1() and yn() functions compute Bessel functions
of x of the second kind of orders 0, 1 and n respectively.
The value of x must be positive.
RETURN VALUES
Upon successful completion, y0(), y1() and yn() will return
the relevant Bessel value of x of the second kind.
If x is NaN, NaN is returned.
If the x argument to y0(), y1() or yn() is negative,
-HUGE_VAL or NaN is returned, and errno may be set to EDOM.
If x is 0.0, -HUGE_VAL is returned and errno may be set to
ERANGE or EDOM.
If the correct result would cause overflow, -HUGE_VAL is
returned and errno may be set to ERANGE.
For exceptional cases, matherr(3M) tabulates the values to
be returned as dictated by Standards other than XPG4.
ERRORS
The y0(), y1() and yn() functions may fail if:
EDOM The value of x is negative.
ERANGE
The value of x is too large in magnitude, or x is 0.0,
or the correct result would cause overflow.
USAGE
An application wishing to check for error situations should
set errno to 0 before calling y0(), y1() or yn(). If errno
is non-zero on return, or the return value is NaN, an error
has occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| MT-Level | MT-Safe |
|_____________________________|_____________________________|
SEE ALSO
isnan(3M), j0(3M), matherr(3M), attributes(5), standards(5)
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