技术问询：哪些R包附加时使用随机过程及相关后续问题

1. Which R packages use a random process when attached? #

Here are a few common examples of packages that trigger random behavior when you call library():

• fortunes: This package is famous for displaying a random R-related quote or "fortune" every time you attach it. It’s a fun little easter egg for R users.
• lucky: When attached, this package randomly selects a short "lucky tip" or piece of R advice to show you.
• praise: Some versions of this package will output a random praise message (like "You’re doing amazing!") when you load it, though this behavior might depend on the package version.

2. Why do some R packages load random numbers? #

There are a few key reasons packages might include random processes during attachment:

• Easter eggs/fun factor: Many packages add random quotes, tips, or messages to make using R feel more engaging. It’s a small touch that builds community and makes the tool feel less sterile.
• Initializing random components: A small number of packages might set up random number generators or seed states during attachment to ensure consistent behavior for functions that rely on randomness later. This is less common than the fun use case, though.
• Demoing functionality: Some teaching-focused packages might generate random sample data on attachment to quickly show users how the package’s tools work without requiring extra setup.

3. Is there a way to generate a list of all R packages that use a random process when attached? #

There’s no perfect, automated way to capture every single one (since some packages might hide random behavior in indirect calls), but you can use these approaches to find candidates:

Method 1: Scan package .onAttach() functions

R packages run setup code during attachment via the .onAttach() function. You can write a script to check if this function calls random number generators or sampling functions:

# Get list of all installed packages
installed_pkgs <- installed.packages()[, "Package"]

# Initialize empty vector to store matches
random_attach_pkgs <- character(0)

# Loop through each package
for (pkg in installed_pkgs) {
  # Safely retrieve the .onAttach function (if it exists)
  attach_fun <- tryCatch(
    getFromNamespace(".onAttach", ns = pkg),
    error = function(e) NULL
  )
  
  if (!is.null(attach_fun)) {
    # Convert function body to text and check for random-related calls
    fun_text <- deparse(body(attach_fun))
    random_patterns <- c("sample", "runif", "rnorm", "rpois", "set.seed", "sample.int")
    
    if (any(grepl(paste(random_patterns, collapse = "|"), fun_text))) {
      random_attach_pkgs <- c(random_attach_pkgs, pkg)
    }
  }
}

# Print the results
cat("Packages with random behavior on attachment:\n", paste(random_attach_pkgs, collapse = ", "))

Note: This won’t catch packages that use randomness via indirect calls (e.g., .onAttach() calls an internal function that runs random code), but it works for most obvious cases.

Method 2: Check package documentation or community discussions

Many packages document their easter egg behavior in READMEs or vignettes. You can also search R-focused communities for threads about packages with random attachment behavior—other users often share these gems.

内容的提问来源于stack exchange，提问作者Sean Raleigh