the end point
Chat with our AI personalities
You cannot, unless it is a null vector. As a point.
Vector
(-y, x) is generally a point in the Cartesian plane - not a vector nor a scalar. You can have a vector going from any point in the plane to the point (-y, x) but that is not the same thing.
(0,0,0,0)
The normal vector to the surface is a radius at the point of interest.