Calculate 2D or 3D covariance matrix using unscaled congruence coefficient. Skips any missing values in computation of covariance matrix
An N x D x M array where N is the number of landmarks, D is the number of dimensions (2 or 3), and M is the number of specimens.
This function does not guarantee that the returned matrix is
positive definite. If the covariance matrix is not positive definite
a warning is given and the matrix can be bent to create the closest
positive definite matrix with
N x N covariance matrix
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