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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:
    Functions  j0,  j1, and  jn return Bessel functions of the first kind.

    Functions  y0,  y1, and  yn return Bessel functions of the second kind.
    The argument x must be positive.  If x is negative,  _matherr will be
    called to print a DOMAIN error message to  stderr, set  errno to  EDOM,
    and return the value -HUGE_VAL.  This error handling can be modified by
    using the  matherr routine.

Returns:
    These functions return the result of the desired Bessel function of x.

Example:
    #include <stdio.h>
    #include <math.h>

    void main()
      {
         double x, y, z;

         x = j0( 2.4 );
         y = y1( 1.58 );
         z = jn( 3, 2.4 );
         printf( "j0(2.4) = %f, y1(1.58) = %f\n", x, y );
         printf( "jn(3,2.4) = %f\n", z );
      }

Classification:
    WATCOM

Systems:
     j0 - Math

    j1 - Math
    jn - Math
    y0 - Math
    y1 - Math
    yn - Math

See Also:
    matherr