Mathematical Library Functions                             y0(3M)



NAME
     y0, y0f, y0l, y1, y1f, y1l, yn, ynf, ynl - Bessel  functions
     of the second kind

SYNOPSIS
     c99 [ flag... ] file... -lm [ library... ]
     #include 

     double y0(double x);


     float y0f(float x);


     long double y0l(long double x);


     double y1(double x);


     float y1f(float x);


     long double y1l(long double x);


     double yn(int n, double x);


     float ynf(int n, float x);


     long double ynl(int n, long double x);


DESCRIPTION
     These functions compute Bessel functions of x of the  second
     kind of orders 0, 1 and n, respectively.

RETURN VALUES
     Upon  successful  completion,  these  functions  return  the
     relevant Bessel value of x of the second kind.


     If x is NaN, a NaN is returned.


     If x is negative, -HUGEVAL or NaN is returned.


     If x is 0.0, -HUGEVAL is returned.




SunOS 5.11          Last change: 12 Jul 2006                    1






Mathematical Library Functions                             y0(3M)



     If the correct result would  cause  overflow,  -HUGEVAL  is
     returned.


     For exceptional cases, matherr(3M) tabulates the  values  to
     be returned as specified by SVID3 and XPG3.

ERORS
     No errors are returned.

USAGE
     An application wanting to check for exceptions  should  call
     feclearexcept(FEALEXCEPT) before calling these functions.
     On  return,  if  fetestexcept(FEINVALID    FEDIVBYZERO  
     FEOVERFLOW    FEUNDERFLOW)  is non-zero, an exception has
     been raised. An application should either examine the return
     value  or check the floating point exception flags to detect
     exceptions.

ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     
           ATRIBUTE TYPE               ATRIBUTE VALUE       
    
     Interface Stability          See below.                  
    
     MT-Level                     MT-Safe                     
    



     The y0(), y1(), and yn() functions are Standard. The  y0f(),
     y0l(), y1f(), y1l(), ynf(), and ynl() functions are Stable.

SEE ALSO
     isnan(3M),  feclearexcept(3M),   fetestexcept(3M),   j0(3M),
     math.h(3HEAD), matherr(3M), attributes(5), standards(5)














SunOS 5.11          Last change: 12 Jul 2006                    2