J0(3)                     OpenBSD Programmer's Manual                    J0(3)

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



SYNOPSIS
     #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
     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 Bessel0 n for the real value x.

     The functions y0(), y0f(), y1() and y1f() compute the linearly indepen-
     dent Bessel function of the second kind of the order 0 and the order 1,
     respectively, for the positive integer value x (expressed as a double);
     the functions yn() and ynf() compute the Bessel function of the second
     kind for the integer Bessel0 n for the positive integer value x (ex-
     pressed as a double).

RETURN VALUES
     If these functions are successful, the computed value is returned, other-
     wise the global variable errno is set to EDOM or ERANGE.

SEE ALSO
     math(3)

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

OpenBSD 2.6                     April 19, 1991                               2