Issue printing R markdown code chunk time.

Publishing Your Results
1

I copied the following code from the Rmarkdown cook book, but seem to be getting an empty list everytime I call all_times.

all_times <- list()  # store the time for each chunk
knitr::knit_hooks$set(time_it = local({
  now <- NULL
  function(before, options) {
    if (before) {
      now <<- Sys.time()
    } else {
      res <- difftime(Sys.time(), now)
      all_times[[options$label]] <<- res
    }
  }
}))

knitr::opts_chunk$set(time_it = TRUE)
2

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