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Exercise

Reading files in parallel

The Data Analyst on your team has a long list of files that contains birth data from the USA. She has written the following loop to read them all into her workspace:

  df_all <- NULL

  for (file in file_list) {

    df <- read.csv(file)
    df_all <- rbind(df_all, df)
  }

The only problem is that this is taking too long. You, as the resident R expert, want to help. The parallel and profvis packages have been loaded for you.

Instructions 1/3

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  • Profile the given code using profvis().