Polynom

Hier ein kleines Skript, wie man in Java mit einem Polynom 5ten Grades rechnnen kann:

[code:1]public class Polynomial
{

Term[] x= new Term[5];
Term[] x_new= new Term[5];

// Constructor Polynomial which consumes terms
public Polynomial (Term a, Term b, Term c, Term d, Term e)
{
x[0] = a;
x[1] = b;
x[2] = c;
x[3] = d;
x[4] = e;
}

// Method add, which consumes an other polynomial and returns an polynomial
public Polynomial add(Polynomial poly)
{
for (int i = 0; i <x.length; i++)
{
if(this.x.getExponent() == poly.x[i].getExponent())
{
x_new[i] = new Term(this.x[i].getFactor() + poly.x[i].getFactor(), x[i].getExponent());
}
}

Polynomial addPoly = new Polynomial(x_new[0], x_new[1], x_new[2], x_new[3], x_new[4]);
return addPoly;
}


// Method sub, which consumes an other polynomial and returns an polynomial
public Polynomial sub(Polynomial poly)
{
for (int i = 0; i <x.length; i++)
{
if(this.x[i].getExponent() == poly.x[i].getExponent())
{
x_new[i] = new Term(this.x[i].getFactor() - poly.x[i].getFactor(), x[i].getExponent());
}
}

Polynomial subPoly = new Polynomial(x_new[0], x_new[1], x_new[2], x_new[3], x_new[4]);
return subPoly;
}

// Method mul, which consumes an other polynomial and returns an polynomial
public Polynomial mul(Polynomial poly)
{
for (int i = 0; i <x.length; i++)
{
for (int k = 0; k<x.length; k++)
{
x_new[i] = new Term(this.x[i].getFactor() * poly.x[k].getFactor(), this.x[i].getExponent() + poly.x[k].getExponent() );
}
}
Polynomial mulPoly = new Polynomial(x_new[0], x_new[1], x_new[2], x_new[3], x_new[4]);

return mulPoly;
}

// Method mul, which consumes a factor and returns an polynomial
public Polynomial mul(int factor)
{
for (int i = 0; i <x.length; i++)
{
x_new[i] = new Term(this.x[i].getFactor() * factor, x[i].getExponent());
}
Polynomial mulPoly = new Polynomial(x_new[0], x_new[1], x_new[2], x_new[3], x_new[4]);

return mulPoly;
}

// Method mul, which consumes a term and returns an polynomial
public Polynomial mul(Term term)
{
for (int i = 0; i <x.length; i++)
{
x_new[i] = new Term(this.x[i].getFactor() * term.getFactor(), this.x[i].getExponent() + term.getExponent());
}
Polynomial mulPoly = new Polynomial(x_new[0], x_new[1], x_new[2], x_new[3], x_new[4]);

return mulPoly;
}


// Method toString, which returns a String representation of the polynomial
public String toString()
{
String string = "" ;
for (int i = 0; i <x.length; i++)
{
if (this.x[i].getFactor() > 0 this.x[i].getFactor() < 0 )
{
if (this.x[i].getExponent()== 0)
string = string + "+" + this.x[i].getFactor();
else string = string + "+" + this.x[i].getFactor() + "x" + "^" + this.x[i].getExponent();
}
}

// Helps to replace "+-" through "-"
String to_replace = "+-";
String _with= "-";
string = string.replace(to_replace, _with);

return string;
}

}[/code:1]