TITLE(length @@ Length of a Vector or List)
USAGE(
length(x)
length(x) <- n
)
ALIAS(length)
DESCRIPTION(
If LANG(x) is a vector or list LANG(length)
returns the length of LANG(x).
Otherwise, LANG(length) returns LANG(NA).
PARA
The second form above can be used to reset
the length of a vector.
If a vector is shortened, extra values are discarded
and when a vector is lengthened, it is padded out to
its new length with LANG(NA)s.
)
