Turns an incremental triangle into a cumulative one by running cumulative
sums along the rows (development direction).
Usage
create_cumulative_triangle(trg)
Arguments
- trg
An incremental triangle (numeric matrix) where the upper-right
NA corner is preserved.
Value
A numeric matrix of the same shape, cumulatively summed.
Examples
trg <- matrix(c(10, 5, 2, 20, 7, NA, 15, NA, NA), nrow = 3, byrow = TRUE)
create_cumulative_triangle(trg)
#> [,1] [,2] [,3]
#> [1,] 10 15 17
#> [2,] 20 27 NA
#> [3,] 15 NA NA