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org.mariuszgromada.math.mxparser.mathcollection.Evaluate Maven / Gradle / Ivy

/*
 * @(#)Evaluate.java        4.4.3    2022-05-28
 *
 * MathParser.org-mXparser DUAL LICENSE AGREEMENT as of date 2022-05-22
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 * PRODUCT: MathParser.org-mXparser SOFTWARE
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 */
package org.mariuszgromada.math.mxparser.mathcollection;

/**
 * Evaluate - currently only polynomial evaluation based on provided coefficients.
 *
 * @author         Mariusz Gromada

 *                 [email protected]

 *                 MathSpace.pl

 *                 MathParser.org - mXparser project page

 *                 mXparser on GitHub

 *                 mXparser on SourceForge

 *                 mXparser on Bitbucket

 *                 mXparser on CodePlex

 *                 Janet Sudoku - project web page

 *                 Janet Sudoku on GitHub

 *                 Janet Sudoku on CodePlex

 *                 Janet Sudoku on SourceForge

 *                 Janet Sudoku on BitBucket

 *                 Scalar Free

 *                 Scalar Pro

 *                 ScalarMath.org

 *
 * @version        4.2.0
 */
public final class Evaluate {
	/**
	 * Polynomial evaluation based on provided coefficients.
	 * @param x                  Point at which polynomial will be evaluated
	 * @param coefficients       Polynomial coefficients
	 * @return                   Polynomial value
	 */
	public static final double polynomial(double x, double[] coefficients) {
		if (Double.isNaN(x)) return Double.NaN;
		if (coefficients == null) return Double.NaN;
		if (coefficients.length == 0) return Double.NaN;
		if (coefficients.length == 1) return coefficients[0];
		double sum = coefficients[coefficients.length - 1];
		if (Double.isNaN(sum)) return Double.NaN;
		for (int i = coefficients.length - 2; i >= 0; i--) {
			if (Double.isNaN(coefficients[i])) return Double.NaN;
			sum *= x;
			sum += coefficients[i];
		}
        return sum;
	}
	/**
	 * Polynomial evaluation for the {@link SpecialFunctions#logGamma(double)}
	 * @param x      Argument value
	 * @param coef   List of polynomial coefficients
	 * @param n      Polynomial degree
	 * @return Polynomial value
	 */
	public static final double p1evl(double x, double[] coef, int n) {
		double ans;
		ans = x + coef[0];
		for(int i=1; i