Nothing

```
#' Subsets an array using a list with indices or names
#'
#' @param X The array to subset
#' @param index A list of vectors to use for subsetting, or vector if along is given
#' @param along Along which dimension to subset if index is a vector; default
#' is last dimension; argument is ignored if X is a vector
#' @param drop Remove unused dimensions after mapping; default: TRUE
#' @return The subset of the array
#' @export
subset = function(X, index, along=-1, drop=FALSE) {
if (!is.list(index)) {
# ignore along for vectors
if (is.atomic(X) && is.vector(X))
along = 1
# this is required because as.array() will fail on dplyr:df
if (is.data.frame(X))
ndim_X = length(dim(X))
else
ndim_X = length(dim(as.array(X)))
# create a subsetting list that covers the whole array first,
# then set the dimension we are working on to what is requested
tmp = base::rep(list(TRUE), ndim_X)
# by default, subset the last dimension
if (along == -1)
along = ndim_X
tmp[[along]] = index
index = tmp
}
if (any(is.na(unlist(index))))
stop("trying to subset with NA in index")
do.call(function(...) `[`(X, ..., drop=drop), index)
}
```

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