You may pad the result with the padding value of your choice

padding is a keyword argument

• if you assign e.g. padding = missing, the result will be padded
• you may pad using any defined value and all types except Nothing
• example pads(missing, 0, nothing, NaN, '∅', AbstractString)

using RollingFunctions

𝐷𝑎𝑡𝑎₁ = [1, 2, 3, 4, 5] 𝐷𝑎𝑡𝑎₂ = [5, 4, 3, 2, 1] 𝐷𝑎𝑡𝑎₃ = [1, 2, 3, 2, 1]

𝑀 = hcat(𝐷𝑎𝑡𝑎₁,𝐷𝑎𝑡𝑎₂,𝐷𝑎𝑡𝑎₃) #= 5×3 Matrix{Int64}: 1 5 1 2 4 2 3 3 3 4 2 2 5 1 1 =#

𝐹𝑢𝑛𝑐 = sum 𝑆𝑝𝑎𝑛 = 3

result = rolling(𝐹𝑢𝑛𝑐, 𝑀, 𝑆𝑝𝑎𝑛; padding=missing) #= 5×3 Matrix{Union{Missing,Int64}}: missing missing missing missing missing missing 6 12 6 9 9 7 12 6 6 =#

Give me the real values first, pad to the end.

result = rolling(𝐹𝑢𝑛𝑐, 𝑀, 𝑆𝑝𝑎𝑛; padding = missing, padlast=true) #= 5×3 Matrix{Union{Missing,Int64}}: 6 12 6 9 9 7 12 6 6 missing missing missing missing missing missing =#

technical aside: this is not the same as reverse(rolling(𝒮,𝐷𝑎𝑡𝑎, 𝑆𝑝𝑎𝑛; padding = missing).