Manpage of JN

JN

Section: NEWLIB (3)
Updated: 2005 Feb 23
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NAME

1.9 `jN',`jNf',`yN',`yNf'--Bessel functions

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 Bessel functions are a family of functions that solve the differential equation
       2               2    2
      x  y'' + xy' + (x  - p )y  = 0
   These functions have many applications in engineering and physics.

`jn' calculates the Bessel function of the first kind of order N. `j0' and `j1' are special cases for order 0 and order 1 respectively.

Similarly, `yn' calculates the Bessel function of the second kind of order N, and `y0' and `y1' are special cases for order 0 and 1.

`jnf', `j0f', `j1f', `ynf', `y0f', and `y1f' perform the same calculations, but on `float' rather than `double' values.

RETURNS

The value of each Bessel function at X is returned.

PORTABILITY

None of the Bessel functions are in ANSI C.

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Time: 21:25:19 GMT, May 16, 2005