Copied from
http://www.cookbook-r.com/Manipulating_data/Comparing_vectors_or_factors_with_NA/.
This function returns `TRUE`

wherever elements are the same, including `NA`

's,
and `FALSE`

everywhere else.

compareNA(v1, v2)

v1 | A vector |
---|---|

v2 | A vector |

a <- c(NA, 1, 2, NA) b <- c(1, NA, 2, NA) compareNA(a, b)#> [1] FALSE FALSE TRUE TRUE