How to convert array to data.table in R and back?

Question

is this the most straightforward way to convert an array into a data.table?

require(data.table)
require(ggplot2)

# this returns a data.tabl         


        

Answer 1

convert the data.table back into the original array

Here a quick and dirty solution

DT2 = as.data.table(aaa)
aaa2= array(dim = dim(aaa))
invisible(DT2[, aaa2[V1, V2, V3] <<- value, .(V1,V2,V3)])
all.equal(aaa,aaa2) # TRUE