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Mathematical Library Functionsy0(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 attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
MT-LevelMT-Safe

SEE ALSO

 

isnan(3M), j0(3M), matherr(3M), attributes(5), standards(5)


SunOS 5.9Go To TopLast Changed 29 Dec 1996

 
      
      
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