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## cern.jet.math
Class Bessel

    java.lang.Object
      cern.jet.math.Constants
          cern.jet.math.Bessel

public class Bessel
extends Constants

Bessel and Airy functions.

Method Summary
`static double` | `i0(double x)` Returns the modified Bessel function of order 0 of the argument.
`static double` | `i0e(double x)` Returns the exponentially scaled modified Bessel function of order 0 of the argument.
`static double` | `i1(double x)` Returns the modified Bessel function of order 1 of the argument.
`static double` | `i1e(double x)` Returns the exponentially scaled modified Bessel function of order 1 of the argument.
`static double` | `j0(double x)` Returns the Bessel function of the first kind of order 0 of the argument.
`static double` | `j1(double x)` Returns the Bessel function of the first kind of order 1 of the argument.
`static double` | `jn(int n, double x)` Returns the Bessel function of the first kind of order `n` of the argument.
`static double` | `k0(double x)` Returns the modified Bessel function of the third kind of order 0 of the argument.
`static double` | `k0e(double x)` Returns the exponentially scaled modified Bessel function of the third kind of order 0 of the argument.
`static double` | `k1(double x)` Returns the modified Bessel function of the third kind of order 1 of the argument.
`static double` | `k1e(double x)` Returns the exponentially scaled modified Bessel function of the third kind of order 1 of the argument.
`static double` | `kn(int nn, double x)` Returns the modified Bessel function of the third kind of order `nn` of the argument.
`static double` | `y0(double x)` Returns the Bessel function of the second kind of order 0 of the argument.
`static double` | `y1(double x)` Returns the Bessel function of the second kind of order 1 of the argument.
`static double` | `yn(int n, double x)` Returns the Bessel function of the second kind of order `n` of the argument.

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Method Detail

### i0

    public static double i0(double x)
                     throws ArithmeticException

  Returns the modified Bessel function of order 0 of the argument.

  The function is defined as `i0(x) = j0( ix )`.

  The range is partitioned into the two intervals [0,8] and (8, infinity). Chebyshev polynomial expansions are employed in each interval.

  Parameters:
    `x` - the value to compute the bessel function of.
  Throws:
    `ArithmeticException`

### i0e

    public static double i0e(double x)
                      throws ArithmeticException

  Returns the exponentially scaled modified Bessel function of order 0 of the argument.

  The function is defined as `i0e(x) = exp(-|x|) j0( ix )`.

  Parameters:
    `x` - the value to compute the bessel function of.
  Throws:
    `ArithmeticException`

### i1

    public static double i1(double x)
                     throws ArithmeticException

  Returns the modified Bessel function of order 1 of the argument.

  The function is defined as `i1(x) = -i j1( ix )`.

  The range is partitioned into the two intervals [0,8] and (8, infinity). Chebyshev polynomial expansions are employed in each interval.

  Parameters:
    `x` - the value to compute the bessel function of.
  Throws:
    `ArithmeticException`

### i1e

    public static double i1e(double x)
                      throws ArithmeticException

  Returns the exponentially scaled modified Bessel function of order 1 of the argument.

  The function is defined as `i1(x) = -i exp(-|x|) j1( ix )`.

  Parameters:
    `x` - the value to compute the bessel function of.
  Throws:
    `ArithmeticException`

### j0

    public static double j0(double x)
                     throws ArithmeticException

  Returns the Bessel function of the first kind of order 0 of the argument.

  Parameters:
    `x` - the value to compute the bessel function of.
  Throws:
    `ArithmeticException`

### j1

    public static double j1(double x)
                     throws ArithmeticException

  Returns the Bessel function of the first kind of order 1 of the argument.

  Parameters:
    `x` - the value to compute the bessel function of.
  Throws:
    `ArithmeticException`

### jn

    public static double jn(int n,
                            double x)
                     throws ArithmeticException

  Returns the Bessel function of the first kind of order `n` of the argument.

  Parameters:
    `n` - the order of the Bessel function.
    `x` - the value to compute the bessel function of.
  Throws:
    `ArithmeticException`

### k0

    public static double k0(double x)
                     throws ArithmeticException

  Returns the modified Bessel function of the third kind of order 0 of the argument.

  The range is partitioned into the two intervals [0,8] and (8, infinity). Chebyshev polynomial expansions are employed in each interval.

  Parameters:
    `x` - the value to compute the bessel function of.
  Throws:
    `ArithmeticException`

### k0e

    public static double k0e(double x)
                      throws ArithmeticException

  Returns the exponentially scaled modified Bessel function of the third kind of order 0 of the argument.

  Parameters:
    `x` - the value to compute the bessel function of.
  Throws:
    `ArithmeticException`

### k1

    public static double k1(double x)
                     throws ArithmeticException

  Returns the modified Bessel function of the third kind of order 1 of the argument.

  The range is partitioned into the two intervals [0,2] and (2, infinity). Chebyshev polynomial expansions are employed in each interval.

  Parameters:
    `x` - the value to compute the bessel function of.
  Throws:
    `ArithmeticException`

### k1e

    public static double k1e(double x)
                      throws ArithmeticException

  Returns the exponentially scaled modified Bessel function of the third kind of order 1 of the argument.

  `k1e(x) = exp(x) * k1(x)`.

  Parameters:
    `x` - the value to compute the bessel function of.
  Throws:
    `ArithmeticException`

### kn

    public static double kn(int nn,
                            double x)
                     throws ArithmeticException

  Returns the modified Bessel function of the third kind of order `nn` of the argument.

  The range is partitioned into the two intervals [0,9.55] and (9.55, infinity). An ascending power series is used in the low range, and an asymptotic expansion in the high range.

  Parameters:
    `nn` - the order of the Bessel function.
    `x` - the value to compute the bessel function of.
  Throws:
    `ArithmeticException`

### y0

    public static double y0(double x)
                     throws ArithmeticException

  Returns the Bessel function of the second kind of order 0 of the argument.

  Parameters:
    `x` - the value to compute the bessel function of.
  Throws:
    `ArithmeticException`

### y1

    public static double y1(double x)
                     throws ArithmeticException

  Returns the Bessel function of the second kind of order 1 of the argument.

  Parameters:
    `x` - the value to compute the bessel function of.
  Throws:
    `ArithmeticException`

### yn

    public static double yn(int n,
                            double x)
                     throws ArithmeticException

  Returns the Bessel function of the second kind of order `n` of the argument.

  Parameters:
    `n` - the order of the Bessel function.
    `x` - the value to compute the bessel function of.
  Throws:
    `ArithmeticException`

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