Missing Data - Untitled

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3.1.2 Missing Data

— Built-in Variable: NA

Missing value.

— Mapping Function: isna (x)

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 ]
     

— Mapping Function: is_nan_or_na (x)

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 ]
     