public Polynomial2D Evaluate(double Val, int Dim) // turn a 2d polynomial into a regular one
{
Polynomial2D pAns;
if (Dim == 0)
{
pAns = new Polynomial2D(0, yOrder);
}
else if (Dim == 1)
{
pAns = new Polynomial2D(xOrder, 0);
}
else
{
throw new Exception("Dimension must be 0 or 1");
}
for (int i = 0; i <= xOrder; i++)
{
for (int j = 0; j <= yOrder; j++)
{
if (Dim == 0)
{
pAns.coefficients[0, j] += pAns.coefficients[i, j] * Math.Pow(Val, i);
}
else
{
pAns.coefficients[i, 0] += pAns.coefficients[i, j] * Math.Pow(Val, j);
}
}
}
return(pAns);
}
public Polynomial2D Convert_2D(int Dim)
{
Polynomial2D p2d;
if (Dim == 0)
{
p2d = new Polynomial2D(order, 0);
}
else if (Dim == 1)
{
p2d = new Polynomial2D(0, order);
}
else
{
throw new Exception("Dim must be 0, 1, or 2");
}
int idx = 0;
for (int i = 0; i <= p2d.xOrder; i++)
{
for (int j = 0; j <= p2d.yOrder; j++)
{
p2d.coefficients[i, j] = coefficients[idx];
idx++;
}
}
return(p2d);
}
public static Polynomial2D operator +(Polynomial2D p2, Polynomial2D p1)
{
var coefficients = addArrays(p2.coefficients, p1.coefficients);
var p3 = new Polynomial2D(coefficients);
return(p3);
}
public static Polynomial2D operator *(Polynomial2D p1, double Scalar)
{
var p2 = new Polynomial2D(p1.xOrder, p1.yOrder);
for (int i = 0; i <= p2.xOrder; i++)
{
for (int j = 0; j <= p2.yOrder; j++)
{
p2.coefficients[i, j] = Scalar * p1.coefficients[i, j];
}
}
return(p2);
}
public static Polynomial2D operator *(Polynomial2D p2, Polynomial2D p1)
{
var p3 = new Polynomial2D(p2.xOrder + p1.xOrder, p2.yOrder + p1.yOrder);
for (int i1 = 0; i1 <= p1.xOrder; i1++)
{
for (int i2 = 0; i2 <= p2.xOrder; i2++)
{
for (int j1 = 0; j1 <= p1.yOrder; j1++)
{
for (int j2 = 0; j2 <= p2.yOrder; j2++)
{
p3.coefficients[i1 + i2, j1 + j2] += p2.coefficients[i2, j2] * p1.coefficients[i1, j1];
}
}
}
}
return(p3);
}
public Polynomial2D Differentiate(int Dim)
{
int xOrderNew;
int yOrderNew;
if (Dim == 0)
{
xOrderNew = Math.Max(xOrder - 1, 0);
yOrderNew = yOrder;
}
else if (Dim == 1)
{
yOrderNew = Math.Max(yOrder - 1, 0);
xOrderNew = xOrder;
}
else
{
throw new Exception("Dimension must be 0 or 1");
}
var pDiff = new Polynomial2D(xOrderNew, yOrderNew);
for (int i = 0; i <= xOrderNew; i++)
{
for (int j = 0; j <= yOrderNew; j++)
{
if (Dim == 0)
{
pDiff.coefficients[i, j] = coefficients[i + 1, j] * (i + 1);
}
else
{
pDiff.coefficients[i, j] = coefficients[i, j + 1] * (j + 1);
}
}
}
return(pDiff);
}
public Polynomial2D Integrate(int Dim)
{
int xOrderNew;
int yOrderNew;
if (Dim == 0)
{
xOrderNew = Math.Max(xOrder + 1, 1);
yOrderNew = yOrder;
}
else if (Dim == 1)
{
yOrderNew = Math.Max(yOrder + 1, 1);
xOrderNew = xOrder;
}
else
{
throw new Exception("Dimension must be 0 or 1");
}
var pInt = new Polynomial2D(xOrderNew, yOrderNew);
for (int i = 0; i <= xOrderNew; i++)
{
for (int j = 0; j <= yOrderNew; j++)
{
if (Dim == 0 && i > 0)
{
pInt.coefficients[i, j] = coefficients[i - 1, j] / ((double)i);
}
else if (Dim == 1 && j > 0)
{
pInt.coefficients[i, j] = coefficients[i, j - 1] / ((double)j);
}
}
}
return(pInt);
}
