//------------------------------------------------------------------------------------------------
public double GetInvariantD()
{
double[ , ] arrayMatrixD = new double[, ] {
{ this.a11, this.a12 },
{ this.a12, this.a22 }
};
RealMatrix matrixD = new RealMatrix(arrayMatrixD);
double invariantD = matrixD.GetDeterminant();
return(invariantD);
}
//------------------------------------------------------------------------------------------------
public double GetInvariantA()
{
double[ , ] arrayMatrixA = new double[, ] {
{ this.a11, this.a12, this.a13 },
{ this.a12, this.a22, this.a23 },
{ this.a13, this.a23, this.a33 }
};
RealMatrix matrixA = new RealMatrix(arrayMatrixA);
double invariantA = matrixA.GetDeterminant();
return(invariantA);
}
//------------------------------------------------------------------------------------------------
//Центр кривой
public Point2D GetCentre()
{
double[ , ] arrayMatrixX = new double[, ] {
{ this.a13, this.a12 },
{ this.a23, this.a22 }
};
RealMatrix matrixX = new RealMatrix(arrayMatrixX);
double[ , ] arrayMatrixY = new double[, ] {
{ this.a11, this.a13 },
{ this.a12, this.a23 }
};
RealMatrix matrixY = new RealMatrix(arrayMatrixY);
double coordinateX = -matrixX.GetDeterminant() / this.GetInvariantD();
double coordinateY = -matrixY.GetDeterminant() / this.GetInvariantD();
Point2D centre = new Point2D(coordinateX, coordinateY);
return(centre);
}
