<!doctype html> <title>CodeMirror: R mode</title> <meta charset="utf-8"/> <link rel=stylesheet href="../../doc/docs.css"> <link rel="stylesheet" href="../../lib/codemirror.css"> <script src="../../lib/codemirror.js"></script> <script src="r.js"></script> <style> .CodeMirror { border-top: 1px solid silver; border-bottom: 1px solid silver; } .cm-s-default span.cm-semi { color: blue; font-weight: bold; } .cm-s-default span.cm-dollar { color: orange; font-weight: bold; } .cm-s-default span.cm-arrow { color: brown; } .cm-s-default span.cm-arg-is { color: brown; } </style> <div id=nav> <a href="https://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a> <ul> <li><a href="../../index.html">Home</a> <li><a href="../../doc/manual.html">Manual</a> <li><a href="https://github.com/codemirror/codemirror">Code</a> </ul> <ul> <li><a href="../index.html">Language modes</a> <li><a class=active href="#">R</a> </ul> </div> <article> <h2>R mode</h2> <form><textarea id="code" name="code"> X <- list(height = 5.4, weight = 54) cat("Printing objects: "); print(X) print("Accessing individual elements:") cat(sprintf("Your height is %s and your weight is %s\n", X$height, X$weight)) # Functions: square <- function(x) { return(x * x) } cat(sprintf("The square of 3 is %s\n", square(3))) # In R, the last expression in a function is, by default, what is # returned. The idiomatic way to write the function is: square <- function(x) { x * x } # or, for functions with short content: square <- function(x) x * x # Function arguments with default values: cube <- function(x = 5) x * x * x cat(sprintf("Calling cube with 2 : %s\n", cube(2)) # will give 2^3 cat(sprintf("Calling cube : %s\n", cube()) # will default to 5^3. powers <- function(x) list(x2 = x*x, x3 = x*x*x, x4 = x*x*x*x) cat("Powers of 3: "); print(powers(3)) # Data frames df <- data.frame(letters = letters[1:5], '#letter' = 1:5) print(df$letters) print(df$`#letter`) # Operators: m1 <- matrix(1:6, 2, 3) m2 <- m1 %*% t(m1) cat("Matrix product: "); print(m2) # Assignments: a <- 1 b <<- 2 c = 3 4 -> d 5 ->> e </textarea></form> <script> var editor = CodeMirror.fromTextArea(document.getElementById("code"), {}); </script> <p><strong>MIME types defined:</strong> <code>text/x-rsrc</code>.</p> <p>Development of the CodeMirror R mode was kindly sponsored by <a href="https://twitter.com/ubalo">Ubalo</a>.</p> </article>