bessel(3M)                       DG/UX 5.4.2                      bessel(3M)


NAME
       bessel: j0, j1, jn, y0, y1, yn - Bessel functions

SYNOPSIS
       cc [flag ...] file ...  -lm [library ...]

       #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
       j0 and j1 return Bessel functions of x of the first kind of orders 0
       and 1, respectively.  jn returns the Bessel function of x of the
       first kind of order n.

       y0 and y1 return Bessel functions of x of the second kind of orders 0
       and 1, respectively.  yn returns the Bessel function of x of the
       second kind of order n.  The value of x must be positive.

DIAGNOSTICS
       Non-positive arguments cause y0, y1, and yn to return the value -HUGE
       and to set errno to EDOM.  In addition, a message indicating DOMAIN
       error is printed on the standard error output.

       Arguments too large in magnitude cause j0, j1, y0, and y1 to return 0
       and to set errno to ERANGE.  In addition, a message indicating TLOSS
       error is printed on the standard error output.

       Except when the -Xc compilation option is used, these error-handling
       procedures may be changed with the function matherr.  When the -Xa or
       -Xc compilation options are used, HUGEVAL is returned instead of
       HUGE and no error messages are printed.

SEE ALSO
       matherr(3M).












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