ERROR_ELLIPSE - plot an error ellipse, or ellipsoid, defining confidence region ERROR_ELLIPSE(C22) - Given a 2x2 covariance matrix, plot the associated error ellipse, at the origin. It returns a graphics handle of the ellipse that was drawn. ERROR_ELLIPSE(C33) - Given a 3x3 covariance matrix, plot the associated error ellipsoid, at the origin, as well as its projections onto the three axes. Returns a vector of 4 graphics handles, for the three ellipses (in the X-Y, Y-Z, and Z-X planes, respectively) and for the ellipsoid. ERROR_ELLIPSE(C,MU) - Plot the ellipse, or ellipsoid, centered at MU, a vector whose length should match that of C (which is 2x2 or 3x3). ERROR_ELLIPSE(...,'Property1',Value1,'Name2',Value2,...) sets the values of specified properties, including: 'C' - Alternate method of specifying the covariance matrix 'mu' - Alternate method of specifying the ellipse (-oid) center 'conf' - A value betwen 0 and 1 specifying the confidence interval. the default is 0.5 which is the 50% error ellipse. 'scale' - Allow the plot the be scaled to difference units. 'style' - A plotting style used to format ellipses. 'clip' - specifies a clipping ruleRadii. Portions of the ellipse, -oid, outside the ruleRadii will not be shown. NOTES: C must be positive definite for this function to work properly.