Logm(P, Q) computes the projection of a Hermitian PD matrix
Q in the manifold of HPD matrices
equipped with the affine-invariant Riemannian metric to the tangent space attached at the Hermitian PD matrix
P via the logarithmic map as in e.g., \insertCitePFA05pdSpecEst. This is the unique inverse of
the exponential map
a Hermitian positive definite matrix.
a Hermitian positive definite matrix (of equal dimension as
Pennec, X. (2006). Intrinsic statistics on Riemannian manifolds: Basic tools for geometric measurements. Journal of Mathematical Imaging and Vision 25(1), 127-154.
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