Count the number of missing landmarks in an array

1 | ```
countMissing(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. |

A length n vector giving the number of missing landmarks for each specimen.

1 2 3 | ```
A <- array(1:(3*6*7), dim = c(7, 3, 6))
A[2, , 1] <- NA
countMissing(A)
``` |

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