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Why do we obtain five missing values from the following lines of code? x <- 1:5 x[NA]

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Why do we obtain five missing values from the following lines of code?

x <- 1:5
x[NA]

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 NA is a logical type object and the logical vectors are reused to the equal length shared between vector and its subset. For example, x[NA] when iterated five times becomes x[NA, NA, NA, NA, NA].

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