cern.jet.math

Class Polynomial

• public class Polynomial
extends Constants
Polynomial functions.
• Constructor Summary

Constructors
Modifier Constructor and Description
protected Polynomial()
Makes this class non instantiable, but still let's others inherit from it.
• Method Summary

Methods
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.
• 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 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 = 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:
ArithmeticException
• polevl

public static double polevl(double x,
double[] coef,
int N)
throws 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 = 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:
ArithmeticException