j0(), j1(), jn()

Bessel functions of the first kind

Synopsis:

#include <math.h>
double j0( double x );
double j1( double x );
double jn( int n, double x );

Description:

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

The argument x must be positive. If it is negative, _matherr() is 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:

The result of the desired Bessel function of x.

Examples:

#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

See also:

errno, matherr(), y0(), y1(), yn()