Description Usage Arguments Details Value

Expected covariance of two tips at given root-tip time and phylogenetic distance

1 2 |

`alpha, sigma, sigmae` |
POUMM parameters |

`t` |
A non-negative number or vector time from the beginning of the POUMM process (root-tip distance). If a vector, the evaluation is done on each couple (row) from cbind(t, tau). |

`tau` |
A non-negative number or vector indicating the phylogenetic distance between two tips, each of them located at time t from the root. If a vector, the evaluation is done on each couple (row) from cbind(t, tau). |

`tanc` |
A non-negative number or vector indication the root-mrca distance for a couple of tips. Defaults to t-tau/2 corresponding to an ultrametric tree. |

`corr` |
Logical indicating whether correlation should be returned instead of covariance. |

`as.matrix` |
Logical indicating if a variance-covariance matrix should be returned. |

The function assumes that the two tips are at equal distance t from the root. This implies that the root-tip distance of their mrca is t - tau/2.

If as.matrix == FALSE, a number. Otherwise a two by two symmetric matrix. If t or tau is a vector of length bigger than 1, then a vector of numbers or a list of matrices.

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