bessel(3M)            MATHEMATICAL LIBRARY             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 func-
     tion 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 func-
     tion of x of the second kind of order n.   The  value  of  x
     must be positive.

SEE ALSO
     matherr(3M).

DIAGNOSTICS
     Non-positive arguments cause y0, y1, and yn  to  return  the
     value  -HUGE  and to set errno to EDOM.  In addition, a mes-
     sage 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 out-
     put.

     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,
     HUGE_VAL  is  returned instead of HUGE and no error messages
     are printed.






                   Last change: Math Libraries                  1