public virtual Vec2d GetSecondDerivative(double t)
{
UnaryFunction fdx = Derivative.Central(tt => this.GetPosition(tt).X, 2, 5);
UnaryFunction fdy = Derivative.Central(tt => this.GetPosition(tt).Y, 2, 5);
return(new Vec2d(fdx(t), fdy(t)));
}
protected virtual Vec2d GetFirstDerivative(int index, double t)
{
UnaryFunction fdx = Derivative.Central(tt => this.GetPosition(index, tt).X, 1, 5);
UnaryFunction fdy = Derivative.Central(tt => this.GetPosition(index, tt).Y, 1, 5);
return(new Vec2d(fdx(t), fdy(t)));
}
protected virtual Vector2d GetThirdDerivative(int key, double dt)
{
UnaryFunction fdx = Derivative.Central(tt => this.GetPosition(key, tt).X, 3, 5);
UnaryFunction fdy = Derivative.Central(tt => this.GetPosition(key, tt).Y, 3, 5);
return(new Vector2d(fdx(dt), fdy(dt)));
}
public virtual Vec2d GetThirdDerivative(double t)
{
throw new NotImplementedException();
UnaryFunction fdx = Derivative.Central(tt => this.GetPosition(tt).X, 3, 5);
UnaryFunction fdy = Derivative.Central(tt => this.GetPosition(tt).Y, 3, 5);
return(new Vec2d(fdx(t), fdy(t)));
}
protected virtual double GetThirdDerivative(int key, double dt)
{
UnaryFunction fdx = Derivative.Central(tt => this.GetPosition(key, tt), 3, 5);
return(fdx(dt));
}
protected virtual double GetSecondDerivative(int index, double t)
{
UnaryFunction fdx = Derivative.Central(tt => this.GetPosition(index, tt), 2, 5);
return(fdx(t));
}
public virtual double GetThirdDerivative(double t)
{
UnaryFunction fdx = Derivative.Central(tt => this.GetPosition(tt), 3, 5);
return(fdx(t));
}