down.sample(x, factor=2, offset=1) up.sample(x, facter)
down.sample
only, a positive integer as the starting index.
down.sample
returns a vector of length
[(length(x)-offset+1)/factor]
;
up.sample
returns a vector of length
length(x)*factor
.
down.sample
operator decimates
x
by a
factor
and
up.sample
operator repeats each value in
x
by
factor
times.