Combine gtables based on row/column names.
gtable_combine(..., along = 1L, join = "outer")combine(..., along = 1L, join = "outer")
gtables
dimension to align along, 1 = rows,
2 = cols.
when x and y have different names, how should the difference be resolved?
inner keep names that appear in both,
outer keep names that appear in either,
left keep names from x,
and right keep names from y.