POLYNOMIALCURVENORMAL Compute the normal of a polynomial curve.

   N = polynomialCurveNormal(T, XCOEF, YCOEF)
   XCOEF and YCOEF are row vectors of coefficients, in the form:
       [a0 a1 a2 ... an]
   T is a 1x2 row vector, containing the bounds of the parametrization
   variable: T = [T0 T1], with T taking all values between T0 and T1.
   T can also be a larger vector, in this case only bounds are kept.
   N is a 1x2 row vector, containing direction of curve normal in T.
   If T is column vector, the result is a matrix with 2 columns containing
   normal vector for each position.

   The normal is oriented such that oriented angle from derivative
   vector to normal vector equals PI/2. The normal points to the 'left'
   when travelling along the curve.

Package: matgeom