## function (x, arr.ind = FALSE, useNames = TRUE)
## {
## wh <- .Internal(which(x))
## if (arr.ind && !is.null(d <- dim(x)))
## arrayInd(wh, d, dimnames(x), useNames = useNames)
## else wh
## }
## <bytecode: 0x0000000013145a20>
## <environment: namespace:base>