INERTIAELLIPSE Inertia ellipse of a set of points.

   Note: Deprecated! Use equivalentEllipse instead.

   ELL = inertiaEllipse(PTS);
   where PTS is a N*2 array containing coordinates of N points, computes
   the inertia ellipse of the set of points.

   The result has the form:
   ELL = [XC YC A B THETA],
   with XC and YC being the center of mass of the point set, A and B are
   the lengths of the inertia ellipse (see below), and THETA is the angle
   of the main inertia axis with the horizontal (counted in degrees
   between 0 and 180). 
   A and B are the standard deviations of the point coordinates when
   ellipse is aligned with the principal axes.

   Example
   pts = randn(100, 2);
   pts = transformPoint(pts, createScaling(5, 2));
   pts = transformPoint(pts, createRotation(pi/6));
   pts = transformPoint(pts, createTranslation(3, 4));
   ell = inertiaEllipse(pts);
   figure(1); clf; hold on;
   drawPoint(pts);
   drawEllipse(ell, 'linewidth', 2, 'color', 'r');

   See also
     equivalentEllipse

Package: matgeom