J0(3)                     386BSD Programmer's Manual                     J0(3)

NAME
     j0, j1, jn, y0, y1, yn - bessel functions of first and second kind

SYNOPSIS
     #include <math.h>

     double
     j0(double x)

     double
     j1(double x)

     double
     jn(int n, double x)

     double
     y0(double x)

     double
     y1(double x)

     double
     yn(int n, double x)

DESCRIPTION
     The functions j0() and j1() compute the Bessel function of the first kind
     of the order 0 and the order 1, respectively, for the real value x; the
     function jn() computes the Bessel function of the first kind of the
     integer Bessel0 n for the real value x.

     The functions y0() and y1() compute the linearly independent Bessel
     function of the second kind of the order 0 and the order 1, respectively,
     for the postive integer value x (expressed as a double); the function
     yn() computes the Bessel function of the second kind for the integer
     Bessel0 n for the postive integer value x (expressed as a double).

RETURN VALUES
     If these functions are successful, the computed value is returned. On the
     VAX and Tahoe architectures, a negative x value results in an error; the
     global variable errno is set to EDOM and a reserve operand fault is
     generated.

SEE ALSO
     math(3),  infnan(3)

HISTORY
     A set of these functions function appeared in Version 7 AT&T UNIX.

4th Berkeley Distribution       April 19, 1991                               1