Calculate 3D covariance matrix using unscaled congruence coefficient. Skips any missing values in computation of covariance matrix

1 | ```
dotcvm(A)
``` |

`A` |
An N x 3 x M array where N is the number of landmarks, 3 is the number of dimensions, and M is the number of specimens. |

This function does not guarantee that the returned matrix is
positive definite. If the covariance matrix is not positive definite
a warning is given and the matrix can be bent to create the closest
positive definite matrix with `as.matrix(Matrix::nearPD(mat)$mat)`

.

N x N covariance matrix

1 2 |

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