Description Usage Arguments Value

`calcQF`

calculates the quadratic form in the multivariate Gaussian
based on the NNGP approximation, for a specific parameter combination. The
quadratic form is `t(u)C^{-1}v`

.

1 | ```
calcQF(u, v, AD, nID)
``` |

`u` |
Vector; left product. |

`v` |
Vector; right product |

`AD` |
N x (k+1) matrix; the first k columns are the 'A' matrix, and the
last column is the 'D' vector. Represents the Cholesky of |

`nID` |
N x k matrix of neighbor indices. |

A list with two components: (1) an N x 2 array containing the same spatial coordinates, ordered by MMD, and (2) the same thing, but with any NA values removed.

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