Append rows of
frames to the current frame.
This is equivalent to
list.extend() in Python: the frames are
combined by rows, i.e. rbinding a frame of shape [n x k] to a Frame
of shape [m x k] produces a frame of shape [(m + n) x k].
This method modifies the current frame in-place. If you do not want
the current frame modified, then use the
If frame(s) being appended have columns of types different from the current frame, then these columns will be promoted to the largest of their types: bool -> int -> float -> string.
If you need to append multiple frames, then it is more efficient to
collect them into an array first and then do a single
it is to append them one-by-one in a loop.
Appending data to a frame opened from disk will force loading the current frame into memory, which may fail with an OutOfMemory exception if the frame is sufficiently big.
One or more frames to append. These frames should have the same
columnar structure as the current frame (unless option
If True, then the frames are allowed to have mismatching set of columns. Any gaps in the data will be filled with NAs.
If True (default), the columns in frames are matched by their
names. For example, if one frame has columns [“colA”, “colB”,
“colC”] and the other [“colB”, “colA”, “colC”] then we will swap
the order of the first two columns of the appended frame before
performing the append. However if
bynames is False, then the
column names will be ignored, and the columns will be matched
according to their order, i.e. i-th column in the current frame
to the i-th column in each appended frame.