Calculating Cumulative Sums in R

Calculate cumulative sums with the cumsum function.

Note

Original Japanese version: Rで累積和を求める

This is how to calculate cumulative sums in R. A cumulative sum adds each value step by step as you move through a vector. For example, for 1, 2, 3, the first value is 1 because there is no previous value. The second value is \(1 + 2 = 3\), and the third value is \(3 + 3 = 6\), so the result is 1, 3, 6.

In R, you can calculate this easily with the cumsum function.

x <- c(1, 2, 3)
cumsum(x)

[1] 1 3 6