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A convenience function to return the last value which is not NA in a vector
lastNotNa(x, default = "Unknown")
a single element from the last non NA value in x (or the default)
a vector to look for the last value in
a default value to use when all values are NA in a vector
lastNotNa(c(1:4,NA,NA)) lastNotNa(c(letters[1:4],NA,'z',NA)) lastNotNa(c(NA,NA))
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