n <- 15
x <- rnorm(n)
weights <- 0.9 ^ (n:1)
# rolling sums with complete windows
roll_sum(x, width = 5)
# rolling sums with partial windows
roll_sum(x, width = 5, min_obs = 1)
# expanding sums with partial windows
roll_sum(x, width = n, min_obs = 1)
# expanding sums with partial windows and weights
roll_sum(x, width = n, min_obs = 1, weights = weights)
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