This function is designed for illustrating the eigenvectors associated with the covariance matrix for a given bivariate data set. It draws a data ellipse of the data and adds vectors showing the eigenvectors of the covariance matrix.
A two-column matrix or data frame
color for eigenvectors
line width for eigenvectors
length multiplier(s) for eigenvectors
aspect ratio of plot, set to asp=1
by default, and passed to dataEllipse
passed to dataEllipse determining the coverage of the data ellipse(s)
logical; should the points be plotted?
logical; should this call add to an existing plot?
other arguments passed to link[car]{dataEllipse}