// find the cofactor matrix and return the same
public Matrix2D CoFactor()
{
int i1, j1;
double det;
Matrix2D m = new Matrix2D();
Matrix2D CMat = new Matrix2D();
for (var j = 0; j < 2; j++)
{
for (var i = 0; i < 2; i++)
{
i1 = 0;
for (var ii = 0; ii < 2; ii++)
{
if (ii != i)
{
j1 = 0;
for (var jj = 0; jj < 2; jj++)
{
if (jj != j)
{
m.matrix.SetValue(matrix[ii, jj], i1, j1);
j1 = +j1 + 1;
}
}
i1 = i1 + 1;
}
}
det = m.Determinant();
CMat.matrix.SetValue(System.Math.Pow(-1.0, i + j + 2.0) * det, i, j);
}
m = null;
}
return CMat;
}
