cern.jet.math

Class Polynomial

java.lang.Object

cern.jet.math.Constants

cern.jet.math.Polynomial

public class Polynomial
extends Constants

Polynomial functions.

Method Summary

Modifier and Type	Method and Description
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

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

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