This function returns an integer vector with the length of the elements of its argument, which is expected to be a list.
This function returns a vector of the same length as
x containing the lengths of each element.
The current implementation is intended for lists containing vectors
and the C-level length function is used to determine length. This
means no dispatch is done for the elements of the list. If your
list contains S4 objects, you should use
Jeff Gentry and R. Gentleman
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