R

See The R Project for more information.

Hello World

#!/usr/bin/env Rscript

print("Hello World!");

Coding Guide

Language Version

R 4.x

Execution Model

• Interpreted, runs via Rscript
• Top-level R code runs as written
• Code runs sequentially from top to bottom

Key Characteristics

• Vectorized operations
• Case-sensitive
• Functional programming support
• Use cat() / print() to emit output

Fragment Authoring

Write valid R expressions, assignments, and function definitions. Your fragment becomes the script body. They run sequentially. Define helper functions before you call them.

Available Packages

Standard R libraries are available. No additional packages are pre-installed. To install packages, set a CRAN mirror first:

options(repos = c(CRAN = "https://cloud.r-project.org"))
install.packages("package_name")

Note: Installs live only for the lifetime of the run.

Common Patterns

• Print: print("message") or cat("message\n")
• Assignment: vals <- rnorm(5, mean = 10, sd = 2)
• Functions: function(x) x * 2
• Vectors: c(1, 2, 3)
• Random: set.seed(123); rnorm(5)
• Vectorized operations: x <- 1:10; x * 2

Examples

# Simple output
print("Hello, World!")

# Function definition
greet <- function(name) {
  paste("Hello,", name, "!")
}

print(greet("Alice"))

# Vector processing
numbers <- 1:5
squared <- numbers^2
cat("Sum of squares:", sum(squared), "\n")

Caveats

• Make fragments idempotent—repeated runs should succeed without manual cleanup
• For reproducible randomness, call set.seed() before generating random data
• Package installs are ephemeral—include setup logic in the fragment if needed

Fraglet Scripts

Echo Args

#!/usr/bin/env -S fragletc --vein=r-project
args <- commandArgs(trailingOnly = TRUE)
cat("Args:", paste(args, collapse = " "), "\n")

Stdin Upper

#!/usr/bin/env -S fragletc --vein=r-project
input <- readLines(con = "stdin")
cat(toupper(input), "\n")

Test

#!/usr/bin/env -S fragletc --vein=r-project

print("Hello World!");

Connections

Container Info