edu.ksu.cis.kdd.util.stat.distribution
Class Polynomial

java.lang.Object
  edu.ksu.cis.kdd.util.stat.distribution.Constants
      edu.ksu.cis.kdd.util.stat.distribution.Polynomial

public class Polynomial

extends Constants

Polynomial functions.

Note: This is taken directly from cern.jet.math.Polynomial without modifications except this comment.

Field Summary

Fields inherited from class edu.ksu.cis.kdd.util.stat.distribution.Constants

big, biginv, LOGPI, MACHEP, MAXGAM, MAXLOG, MINLOG, SQRTH, SQTPI

Constructor Summary

protected

Polynomial() Makes this class non instantiable, but still let's others inherit from it.

Method Summary

static double	p1evl(double x, double[] coef, int N) Evaluates the given polynomial of degree N at x, assuming coefficient of N is 1.0.
static double	polevl(double x, double[] coef, int N) Evaluates the given polynomial of degree N at x.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Polynomial

protected Polynomial()

Makes this class non instantiable, but still let's others inherit from it.

Method Detail

p1evl

public static double p1evl(double x,
                           double[] coef,
                           int N)
                    throws java.lang.ArithmeticException

Evaluates the given polynomial of degree N at x, assuming coefficient of N is 1.0. Otherwise same as polevl().

                     2          N
 y  =  C  + C x + C x  +...+ C x
        0    1     2          N

 where C  = 1 and hence is omitted from the array.
        N

 Coefficients are stored in reverse order:

 coef[0] = C  , ..., coef[N-1] = C  .
            N-1                   0

 Calling arguments are otherwise the same as polevl().
 

In the interest of speed, there are no checks for out of bounds arithmetic.

Parameters:

x - argument to the polynomial.

coef - the coefficients of the polynomial.

N - the degree of the polynomial.

Throws:

java.lang.ArithmeticException

polevl

public static double polevl(double x,
                            double[] coef,
                            int N)
                     throws java.lang.ArithmeticException

Evaluates the given polynomial of degree N at x.

                     2          N
 y  =  C  + C x + C x  +...+ C x
        0    1     2          N

 Coefficients are stored in reverse order:

 coef[0] = C  , ..., coef[N] = C  .
            N                   0
 

In the interest of speed, there are no checks for out of bounds arithmetic.

Parameters:

x - argument to the polynomial.

coef - the coefficients of the polynomial.

N - the degree of the polynomial.

Throws:

java.lang.ArithmeticException