Functions for working with symmetric positive-definite matrices

is.spd | Check if a matrix is symmetric and positive definite |

spd.center | Center a set of spd matrices |

spd.dist | Distance between two symmetric, positive-definite matrices |

spd.estimate | Regularized covariance estimation |

spd.expmap | Exponential map onto the space of SPD matrices |

spd.fa | Fractional anisotropy of a symmetrix, positive-definite... |

spd.logmap | Log-map onto the tangent space |

spd.mean | Compute the mean of a set of spd matrices |

spd.vectorize | Vectorize and unvectorize a matrix |

spd.whiten | Whiten a symmetric positive definite matrix |

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