nr
Class Polynomial

java.lang.Object
  nr.Polynomial

public class Polynomial
extends java.lang.Object

Polynomial evaluations, from CERN

Method Summary

static double	eval(double x, double[] coef) Evaluates the given polynomial of degree N at x.
static double	eval1(double x, double[] coef) Evaluates the given polynomial of degree N at x, assuming coefficient of N is 1.0.

Methods inherited from class java.lang.Object

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

Method Detail

eval1

public static double eval1(double x,
                           double[] coef)

Evaluates the given polynomial of degree N at x, assuming coefficient of N is 1.0. Otherwise same as polevl().
y = C0 + C1x + C2x2 + … + CNxN
where CN = 1 and hence is omitted from the array.
Coefficients are stored in reverse order:
coef[0] = C_N-1 , hellip, coef[N-1] = C₀
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.

eval

public static double eval(double x,
                          double[] coef)
                   throws java.lang.ArithmeticException

Evaluates the given polynomial of degree N at x.
y = C0 + C1x + C2x2 + … + CNxN
Coefficients are stored in reverse order:
coef[0] = C_N, …, coef[N] = C₀

Parameters:

x - argument to the polynomial.

coef - the coefficients of the polynomial.

N - the degree of the polynomial.

Throws:

java.lang.ArithmeticException