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Return distance between two covariance matrices
RiemannDist(cov.x, cov.y)
Riemann distance between cov.x and cov.y
covariance or correlation matrix
Edgar Zanella
Mitteroecker, P., & Bookstein, F. (2009). The ontogenetic trajectory of the phenotypic covariance matrix, with examples from craniofacial shape in rats and humans. Evolution, 63(3), 727-737. doi:10.1111/j.1558-5646.2008.00587.x