Common operations on DataFrame objects.
In the following code snippets,
x is a
split(x, f, drop = FALSE):
x into a
f, dropping elements corresponding to
unrepresented levels if
mstack(..., .index.var = "name"): Stacks the data frames
passed as through ..., using
.index.var as the index
column name. See
RangedData, which makes heavy use of this class.
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