NAME    [Toc]    [Back]

     j0, j0f, j1, j1f, jn, jnf, y0, y0f, y1, y1f, yn, ynf -- Bessel functions
     of first and second kind

LIBRARY    [Toc]    [Back]

     Math Library (libm, -lm)

SYNOPSIS    [Toc]    [Back]

     #include <math.h>

     double
     j0(double x);

     float
     j0f(float x);

     double
     j1(double x);

     float
     j1f(float x);

     double
     jn(int n, double x);

     float
     jnf(int n, float x);

     double
     y0(double x);

     float
     y0f(float x);

     double
     y1(double x);

     float
     y1f(float x);

     double
     yn(int n, double x);

     float
     ynf(int n, float x);

DESCRIPTION    [Toc]    [Back]

     The functions j0(), j0f(), j1() and j1f() compute the Bessel function of
     the first kind of the order 0 and the order 1, respectively, for the real
     value x; the functions jn() and jnf() compute the Bessel function of the
     first kind of the integer order n for the real value x.

     The functions y0(), y0f(), y1(), and y1f() compute the linearly independent
 Bessel function of the second kind of the order 0 and the order 1,
     respectively, for the positive real value x; the functions yn() and ynf()
     compute the Bessel function of the second kind for the integer order n
     for the positive real value x.

RETURN VALUES    [Toc]    [Back]

     If these functions are successful, the computed value is returned.  On
     the VAX and Tahoe architectures, for the Bessel functions of the second
     kind, a negative or zero x value results in an error; the global variable
     errno is set to EDOM and a reserve operand fault is generated.

SEE ALSO    [Toc]    [Back]

     math(3)

HISTORY    [Toc]    [Back]

     This set of functions appeared in Version 7 AT&T UNIX.


FreeBSD 5.2.1			April 19, 1991			 FreeBSD 5.2.1