org.lsmp.djep.sjep.MutiableMonomial Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jep Show documentation
Show all versions of jep Show documentation
JEP is a Java library for parsing and evaluating mathematical expressions. Use groupId org.fudaa to deploy it in maven central
The newest version!
/* @author rich
* Created on 23-Dec-2004
*
* See LICENSE.txt for license information.
*/
package org.lsmp.djep.sjep;
import org.nfunk.jep.*;
/**
* A mutable monomial representing a * x^i * y^j * ... * z^k.
* There are no requirements that this is in a reduced form
* so some powers can be zero.
*
* @author Rich Morris
* Created on 23-Dec-2004
*/
public class MutiableMonomial
{
PolynomialCreator pc;
PConstant coeff;
int length;
PNodeI terms[];
PNodeI powers[];
/**
* Note arrays parsed may be modified.
*/
public MutiableMonomial(PolynomialCreator pc,PConstant coeff,PNodeI nodes[],PNodeI pows[])
{
this.pc = pc;
this.coeff = coeff;
length = nodes.length;
terms = nodes;
powers = pows;
}
public void mul(PConstant c) throws ParseException
{
coeff = (PConstant) coeff.mul(c);
}
public void div(PConstant c) throws ParseException
{
coeff = (PConstant) coeff.div(c);
}
public void mul(PNodeI term,PNodeI power) throws ParseException
{
for(int i=0;i 0) {
newTerms[pos] = term;
newPowers[pos] = power;
++pos;
done = true;
}
newTerms[pos] = terms[i];
newPowers[pos] = powers[i];
++pos;
}
if(!done)
{
newTerms[pos] = term;
newPowers[pos] = power;
++pos;
}
length = length+1;
terms = newTerms;
powers = newPowers;
}
void power(PConstant c) throws ParseException
{
coeff = (PConstant) coeff.pow(c);
for(int i=0;i 1
else if(terms[i].isOne()) {} // 1^x --> 1
else if(terms[i] instanceof PConstant && powers[i] instanceof PConstant)
{
coeff = (PConstant) coeff.mul(terms[i].pow(powers[i]));
}
else {
newTerms[pos] = terms[i];
newPowers[pos] = powers[i];
++pos;
}
}
length = newLen;
terms = newTerms;
powers = newPowers;
}
PNodeI toPNode() throws ParseException
{
reduce();
if(length ==0) return coeff;
if(coeff.isZero()) return pc.zeroConstant;
return new Monomial(pc,coeff,terms,powers);
}
public String toString()
{
StringBuffer sb = new StringBuffer();
sb.append(coeff.toString());
for(int i=0;i