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Ingy döt Net
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543
Task/Polynomial-long-division/Java/polynomial-long-division.java
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543
Task/Polynomial-long-division/Java/polynomial-long-division.java
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import java.math.BigInteger;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.List;
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public class PolynomialLongDivision {
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public static void main(String[] args) {
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RunDivideTest(new Polynomial(1, 3, -12, 2, -42, 0), new Polynomial(1, 1, -3, 0));
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RunDivideTest(new Polynomial(5, 2, 4, 1, 1, 0), new Polynomial(2, 1, 3, 0));
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RunDivideTest(new Polynomial(5, 10, 4, 7, 1, 0), new Polynomial(2, 4, 2, 2, 3, 0));
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RunDivideTest(new Polynomial(2,7,-24,6,2,5,-108,4,3,3,-120,2,-126,0), new Polynomial(2, 4, 2, 2, 3, 0));
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}
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private static void RunDivideTest(Polynomial p1, Polynomial p2) {
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Polynomial[] result = p1.divide(p2);
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System.out.printf("Compute: (%s) / (%s) = %s reminder %s%n", p1, p2, result[0], result[1]);
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System.out.printf("Test: (%s) * (%s) + (%s) = %s%n%n", result[0], p2, result[1], result[0].multiply(p2).add(result[1]));
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}
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private static final class Polynomial {
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private List<Term> polynomialTerms;
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// Format - coeff, exp, coeff, exp, (repeating in pairs) . . .
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public Polynomial(long ... values) {
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if ( values.length % 2 != 0 ) {
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throw new IllegalArgumentException("ERROR 102: Polynomial constructor. Length must be even. Length = " + values.length);
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}
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polynomialTerms = new ArrayList<>();
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for ( int i = 0 ; i < values.length ; i += 2 ) {
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polynomialTerms.add(new Term(BigInteger.valueOf(values[i]), values[i+1]));
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}
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Collections.sort(polynomialTerms, new TermSorter());
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}
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public Polynomial() {
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// zero
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polynomialTerms = new ArrayList<>();
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polynomialTerms.add(new Term(BigInteger.ZERO, 0));
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}
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private Polynomial(List<Term> termList) {
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if ( termList.size() != 0 ) {
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// Remove zero terms if needed
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for ( int i = 0 ; i < termList.size() ; i++ ) {
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if ( termList.get(i).coefficient.compareTo(Integer.ZERO_INT) == 0 ) {
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termList.remove(i);
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}
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}
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}
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if ( termList.size() == 0 ) {
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// zero
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termList.add(new Term(BigInteger.ZERO,0));
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}
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polynomialTerms = termList;
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Collections.sort(polynomialTerms, new TermSorter());
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}
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public Polynomial[] divide(Polynomial v) {
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Polynomial q = new Polynomial();
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Polynomial r = this;
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Number lcv = v.leadingCoefficient();
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long dv = v.degree();
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while ( r.degree() >= dv ) {
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Number lcr = r.leadingCoefficient();
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Number s = lcr.divide(lcv);
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Term term = new Term(s, r.degree() - dv);
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q = q.add(term);
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r = r.add(v.multiply(term.negate()));
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}
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return new Polynomial[] {q, r};
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}
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public Polynomial add(Polynomial polynomial) {
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List<Term> termList = new ArrayList<>();
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int thisCount = polynomialTerms.size();
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int polyCount = polynomial.polynomialTerms.size();
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while ( thisCount > 0 || polyCount > 0 ) {
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Term thisTerm = thisCount == 0 ? null : polynomialTerms.get(thisCount-1);
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Term polyTerm = polyCount == 0 ? null : polynomial.polynomialTerms.get(polyCount-1);
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if ( thisTerm == null ) {
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termList.add(polyTerm);
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polyCount--;
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}
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else if (polyTerm == null ) {
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termList.add(thisTerm);
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thisCount--;
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}
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else if ( thisTerm.degree() == polyTerm.degree() ) {
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Term t = thisTerm.add(polyTerm);
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if ( t.coefficient.compareTo(Integer.ZERO_INT) != 0 ) {
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termList.add(t);
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}
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thisCount--;
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polyCount--;
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}
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else if ( thisTerm.degree() < polyTerm.degree() ) {
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termList.add(thisTerm);
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thisCount--;
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}
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else {
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termList.add(polyTerm);
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polyCount--;
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}
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}
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return new Polynomial(termList);
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}
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public Polynomial add(Term term) {
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List<Term> termList = new ArrayList<>();
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boolean added = false;
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for ( int index = 0 ; index < polynomialTerms.size() ; index++ ) {
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Term currentTerm = polynomialTerms.get(index);
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if ( currentTerm.exponent == term.exponent ) {
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added = true;
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if ( currentTerm.coefficient.add(term.coefficient).compareTo(Integer.ZERO_INT) != 0 ) {
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termList.add(currentTerm.add(term));
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}
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}
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else {
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termList.add(currentTerm);
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}
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}
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if ( ! added ) {
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termList.add(term);
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}
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return new Polynomial(termList);
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}
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public Polynomial multiply(Polynomial polynomial) {
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List<Term> termList = new ArrayList<>();
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for ( int i = 0 ; i < polynomialTerms.size() ; i++ ) {
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Term ci = polynomialTerms.get(i);
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for ( int j = 0 ; j < polynomial.polynomialTerms.size() ; j++ ) {
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Term cj = polynomial.polynomialTerms.get(j);
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Term currentTerm = ci.multiply(cj);
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boolean added = false;
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for ( int k = 0 ; k < termList.size() ; k++ ) {
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if ( currentTerm.exponent == termList.get(k).exponent ) {
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added = true;
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Term t = termList.remove(k).add(currentTerm);
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if ( t.coefficient.compareTo(Integer.ZERO_INT) != 0 ) {
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termList.add(t);
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}
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break;
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}
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}
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if ( ! added ) {
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termList.add(currentTerm);
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}
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}
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}
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return new Polynomial(termList);
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}
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public Polynomial multiply(Term term) {
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List<Term> termList = new ArrayList<>();
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for ( int index = 0 ; index < polynomialTerms.size() ; index++ ) {
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Term currentTerm = polynomialTerms.get(index);
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termList.add(currentTerm.multiply(term));
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}
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return new Polynomial(termList);
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}
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public Number leadingCoefficient() {
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return polynomialTerms.get(0).coefficient;
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}
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public long degree() {
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return polynomialTerms.get(0).exponent;
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}
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@Override
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public String toString() {
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StringBuilder sb = new StringBuilder();
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boolean first = true;
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for ( Term term : polynomialTerms ) {
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if ( first ) {
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sb.append(term);
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first = false;
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}
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else {
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sb.append(" ");
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if ( term.coefficient.compareTo(Integer.ZERO_INT) > 0 ) {
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sb.append("+ ");
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sb.append(term);
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}
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else {
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sb.append("- ");
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sb.append(term.negate());
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}
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}
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}
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return sb.toString();
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}
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}
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private static final class TermSorter implements Comparator<Term> {
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@Override
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public int compare(Term o1, Term o2) {
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return (int) (o2.exponent - o1.exponent);
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}
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}
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private static final class Term {
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Number coefficient;
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long exponent;
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public Term(BigInteger c, long e) {
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coefficient = new Integer(c);
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exponent = e;
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}
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public Term(Number c, long e) {
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coefficient = c;
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exponent = e;
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}
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public Term multiply(Term term) {
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return new Term(coefficient.multiply(term.coefficient), exponent + term.exponent);
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}
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public Term add(Term term) {
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if ( exponent != term.exponent ) {
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throw new RuntimeException("ERROR 102: Exponents not equal.");
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}
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return new Term(coefficient.add(term.coefficient), exponent);
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}
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public Term negate() {
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return new Term(coefficient.negate(), exponent);
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}
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public long degree() {
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return exponent;
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}
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@Override
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public String toString() {
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if ( coefficient.compareTo(Integer.ZERO_INT) == 0 ) {
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return "0";
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}
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if ( exponent == 0 ) {
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return "" + coefficient;
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}
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if ( coefficient.compareTo(Integer.ONE_INT) == 0 ) {
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if ( exponent == 1 ) {
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return "x";
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}
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else {
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return "x^" + exponent;
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}
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}
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if ( exponent == 1 ) {
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return coefficient + "x";
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}
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return coefficient + "x^" + exponent;
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}
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}
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private static abstract class Number {
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public abstract int compareTo(Number in);
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public abstract Number negate();
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public abstract Number add(Number in);
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public abstract Number multiply(Number in);
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public abstract Number inverse();
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public abstract boolean isInteger();
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public abstract boolean isFraction();
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public Number subtract(Number in) {
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return add(in.negate());
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}
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public Number divide(Number in) {
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return multiply(in.inverse());
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}
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}
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public static class Fraction extends Number {
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private final Integer numerator;
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private final Integer denominator;
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public Fraction(Integer n, Integer d) {
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numerator = n;
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denominator = d;
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}
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@Override
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public int compareTo(Number in) {
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if ( in.isInteger() ) {
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Integer result = ((Integer) in).multiply(denominator);
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return numerator.compareTo(result);
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}
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else if ( in.isFraction() ) {
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Fraction inFrac = (Fraction) in;
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Integer left = numerator.multiply(inFrac.denominator);
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Integer right = denominator.multiply(inFrac.numerator);
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return left.compareTo(right);
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}
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throw new RuntimeException("ERROR: Unknown number type in Fraction.compareTo");
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}
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@Override
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public Number negate() {
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if ( denominator.integer.signum() < 0 ) {
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return new Fraction(numerator, (Integer) denominator.negate());
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}
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return new Fraction((Integer) numerator.negate(), denominator);
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}
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@Override
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public Number add(Number in) {
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if ( in.isInteger() ) {
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//x/y+z = (x+yz)/y
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return new Fraction((Integer) ((Integer) in).multiply(denominator).add(numerator), denominator);
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}
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else if ( in.isFraction() ) {
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Fraction inFrac = (Fraction) in;
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// compute a/b + x/y
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// Let q = gcd(b,y)
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// Result = ( (a*y + x*b)/q ) / ( b*y/q )
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Integer x = inFrac.numerator;
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Integer y = inFrac.denominator;
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Integer q = y.gcd(denominator);
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Integer temp1 = numerator.multiply(y);
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Integer temp2 = denominator.multiply(x);
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Integer newDenom = denominator.multiply(y).divide(q);
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if ( newDenom.compareTo(Integer.ONE_INT) == 0 ) {
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return temp1.add(temp2);
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}
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Integer newNum = (Integer) temp1.add(temp2).divide(q);
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Integer gcd2 = newDenom.gcd(newNum);
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if ( gcd2.compareTo(Integer.ONE_INT) == 0 ) {
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return new Fraction(newNum, newDenom);
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}
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newNum = newNum.divide(gcd2);
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newDenom = newDenom.divide(gcd2);
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if ( newDenom.compareTo(Integer.ONE_INT) == 0 ) {
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return newNum;
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}
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else if ( newDenom.compareTo(Integer.MINUS_ONE_INT) == 0 ) {
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return newNum.negate();
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}
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return new Fraction(newNum, newDenom);
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}
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throw new RuntimeException("ERROR: Unknown number type in Fraction.compareTo");
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}
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@Override
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public Number multiply(Number in) {
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if ( in.isInteger() ) {
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//x/y*z = x*z/y
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Integer temp = numerator.multiply((Integer) in);
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Integer gcd = temp.gcd(denominator);
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if ( gcd.compareTo(Integer.ONE_INT) == 0 || gcd.compareTo(Integer.MINUS_ONE_INT) == 0 ) {
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return new Fraction(temp, denominator);
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}
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Integer newTop = temp.divide(gcd);
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Integer newBot = denominator.divide(gcd);
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if ( newBot.compareTo(Integer.ONE_INT) == 0 ) {
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return newTop;
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}
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if ( newBot.compareTo(Integer.MINUS_ONE_INT) == 0 ) {
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return newTop.negate();
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}
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return new Fraction(newTop, newBot);
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}
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else if ( in.isFraction() ) {
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Fraction inFrac = (Fraction) in;
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// compute a/b * x/y
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Integer tempTop = numerator.multiply(inFrac.numerator);
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Integer tempBot = denominator.multiply(inFrac.denominator);
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Integer gcd = tempTop.gcd(tempBot);
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if ( gcd.compareTo(Integer.ONE_INT) == 0 || gcd.compareTo(Integer.MINUS_ONE_INT) == 0 ) {
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return new Fraction(tempTop, tempBot);
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}
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Integer newTop = tempTop.divide(gcd);
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Integer newBot = tempBot.divide(gcd);
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if ( newBot.compareTo(Integer.ONE_INT) == 0 ) {
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return newTop;
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}
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if ( newBot.compareTo(Integer.MINUS_ONE_INT) == 0 ) {
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return newTop.negate();
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}
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return new Fraction(newTop, newBot);
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}
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throw new RuntimeException("ERROR: Unknown number type in Fraction.compareTo");
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}
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@Override
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public boolean isInteger() {
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return false;
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}
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@Override
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public boolean isFraction() {
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return true;
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}
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@Override
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public String toString() {
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return numerator.toString() + "/" + denominator.toString();
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}
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@Override
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public Number inverse() {
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if ( numerator.equals(Integer.ONE_INT) ) {
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return denominator;
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}
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else if ( numerator.equals(Integer.MINUS_ONE_INT) ) {
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return denominator.negate();
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}
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else if ( numerator.integer.signum() < 0 ) {
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return new Fraction((Integer) denominator.negate(), (Integer) numerator.negate());
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}
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return new Fraction(denominator, numerator);
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}
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}
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public static class Integer extends Number {
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private BigInteger integer;
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public static final Integer MINUS_ONE_INT = new Integer(new BigInteger("-1"));
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public static final Integer ONE_INT = new Integer(new BigInteger("1"));
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public static final Integer ZERO_INT = new Integer(new BigInteger("0"));
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public Integer(BigInteger number) {
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this.integer = number;
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}
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public int compareTo(Integer val) {
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return integer.compareTo(val.integer);
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}
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@Override
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public int compareTo(Number in) {
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if ( in.isInteger() ) {
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return compareTo((Integer) in);
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}
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else if ( in.isFraction() ) {
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Fraction frac = (Fraction) in;
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BigInteger result = integer.multiply(frac.denominator.integer);
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return result.compareTo(frac.numerator.integer);
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}
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throw new RuntimeException("ERROR: Unknown number type in Integer.compareTo");
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}
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@Override
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public Number negate() {
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return new Integer(integer.negate());
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}
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public Integer add(Integer in) {
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return new Integer(integer.add(in.integer));
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}
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@Override
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public Number add(Number in) {
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if ( in.isInteger() ) {
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return add((Integer) in);
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}
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else if ( in.isFraction() ) {
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Fraction f = (Fraction) in;
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Integer top = f.numerator;
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Integer bot = f.denominator;
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return new Fraction((Integer) multiply(bot).add(top), bot);
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}
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throw new RuntimeException("ERROR: Unknown number type in Integer.add");
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}
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@Override
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public Number multiply(Number in) {
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if ( in.isInteger() ) {
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return multiply((Integer) in);
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}
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else if ( in.isFraction() ) {
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// a * x/y = ax/y
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Integer x = ((Fraction) in).numerator;
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Integer y = ((Fraction) in).denominator;
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Integer temp = (Integer) multiply(x);
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Integer gcd = temp.gcd(y);
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if ( gcd.compareTo(Integer.ONE_INT) == 0 || gcd.compareTo(Integer.MINUS_ONE_INT) == 0 ) {
|
||||
return new Fraction(temp, y);
|
||||
}
|
||||
Integer newTop = temp.divide(gcd);
|
||||
Integer newBot = y.divide(gcd);
|
||||
if ( newBot.compareTo(Integer.ONE_INT) == 0 ) {
|
||||
return newTop;
|
||||
}
|
||||
if ( newBot.compareTo(Integer.MINUS_ONE_INT) == 0 ) {
|
||||
return newTop.negate();
|
||||
}
|
||||
return new Fraction(newTop, newBot);
|
||||
}
|
||||
throw new RuntimeException("ERROR: Unknown number type in Integer.add");
|
||||
}
|
||||
|
||||
public Integer gcd(Integer in) {
|
||||
return new Integer(integer.gcd(in.integer));
|
||||
}
|
||||
|
||||
public Integer divide(Integer in) {
|
||||
return new Integer(integer.divide(in.integer));
|
||||
}
|
||||
|
||||
public Integer multiply(Integer in) {
|
||||
return new Integer(integer.multiply(in.integer));
|
||||
}
|
||||
|
||||
@Override
|
||||
public boolean isInteger() {
|
||||
return true;
|
||||
}
|
||||
|
||||
@Override
|
||||
public boolean isFraction() {
|
||||
return false;
|
||||
}
|
||||
|
||||
@Override
|
||||
public String toString() {
|
||||
return integer.toString();
|
||||
}
|
||||
|
||||
@Override
|
||||
public Number inverse() {
|
||||
if ( equals(ZERO_INT) ) {
|
||||
throw new RuntimeException("Attempting to take the inverse of zero in IntegerExpression");
|
||||
}
|
||||
else if ( this.compareTo(ONE_INT) == 0 ) {
|
||||
return ONE_INT;
|
||||
}
|
||||
else if ( this.compareTo(MINUS_ONE_INT) == 0 ) {
|
||||
return MINUS_ONE_INT;
|
||||
}
|
||||
return new Fraction(ONE_INT, this);
|
||||
}
|
||||
|
||||
}
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue