datatable.Frame.countna1()¶
countna1
()
Return the number of NA values in a single-column Frame.
This function is a shortcut for:
DT.countna()[0, 0]
Parameters¶
except
ValueError
If called on a Frame that has more or less than one column.
return
int
See Also¶
.countna()
– similar to this method, but can be applied to a Frame with an arbitrary number of columns.dt.count()
– function for counting non-NA (“valid”) values in a column; can also be applied per-group.
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