unit normal vector

Hi How icant to compute the unit vectors normal of an elipse?

a=0:0.063:2*pi;

x=[2 + (2*cos(a))];

y=[1 + (sin(a))];

e1=[x;y]';

[Friedrich]

Not really a ML questions. Its more a basic math questions

http://people.maths.ox.ac.uk/earl/lecture11a.pdf

Answer 1

[Sean de Wolski]

   doc norm

will probably be your friend