Return a logical vector indicating which cases are complete, i.e., have no missing values.
a sequence of vectors, matrices and data frames.
A logical vector specifying which observations/rows have no missing values across the entire sequence.
A current limitation of this function is that it uses low level
functions to determine lengths and missingness, ignoring the
class. This will lead to spurious errors when some columns
have classes with
methods, for example
"POSIXlt", as described
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