R - how to get a value of a multi-dimensional array by a vector of indices

Question

Let\'s say I have a multi-dimensional array called pi, and its number of dimensions isn\'t known until the runtime:

dims <- rep(3, dim_count)         


        

Answer 1

do.call("[",...) seems to work.

indexes <- c(1,2,3,3,3)
pi[1,2,3,3,3] <- 17  ## so we know if we succeeded or not
do.call("[",c(list(pi),as.list(indexes)))

Note that your example wouldn't work -- your dimensions were all 3, but some of your index elements were >3 ...