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NA
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.
TRUE
FALSE
compareNA(v1, v2)
A logical vector, indicating positions where two vectors are same or differ.
A vector
a <- c(NA, 1, 2, NA) b <- c(1, NA, 2, NA) compareNA(a, b)
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