Description Usage Arguments References See Also Examples

`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 `Expm`

.

1 | ```
Logm(P, Q)
``` |

`P` |
a Hermitian positive definite matrix. |

`Q` |
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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