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Missing Data

NA Built-in Variable
Missing value.

isna (x) Mapping Function
Return 1 for elements of x that are NA (missing) values and zero otherwise. For example,
is_NA ([13, Inf, NA, NaN])
     => [ 0, 0, 1, 0 ]

is_nan_or_na (x) Mapping Function
Return 1 for elements of x that are NaN or NA (missing) values and zero otherwise. For example,
is_NAN_or_NA ([13, Inf, NA, NaN])
     => [ 0, 0, 1, 1 ]