datatable.union()¶
Find the union of values in all frames
.
Each frame should have only a single column or be empty. The values in each frame will be treated as a set, and this function will perform the union operation on these sets.
The dt.union(*frames)
operation is equivalent to
dt.unique(dt.rbind(*frames))
.
Parameters¶
Frame
| Frame
| ...
Input single-column frames.
Frame
A single-column frame. The column stype is the smallest common
stype of columns in the frames
.
ValueError
The exception is raised when one of the input frames has more than one column.
NotImplementedError
The exception is raised when one of the frame columns has stype obj64
.
See Also¶
intersect()
– calculate the set intersection of values in the frames.setdiff()
– calculate the set difference between the frames.symdiff()
– calculate the symmetric difference between the sets of values in the frames.unique()
– find unique values in a frame.