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      1 <!doctype html>
      2 
      3 <title>CodeMirror: R mode</title>
      4 <meta charset="utf-8"/>
      5 <link rel=stylesheet href="../../doc/docs.css">
      6 
      7 <link rel="stylesheet" href="../../lib/codemirror.css">
      8 <script src="../../lib/codemirror.js"></script>
      9 <script src="r.js"></script>
     10 <style>
     11       .CodeMirror { border-top: 1px solid silver; border-bottom: 1px solid silver; }
     12       .cm-s-default span.cm-semi { color: blue; font-weight: bold; }
     13       .cm-s-default span.cm-dollar { color: orange; font-weight: bold; }
     14       .cm-s-default span.cm-arrow { color: brown; }
     15       .cm-s-default span.cm-arg-is { color: brown; }
     16     </style>
     17 <div id=nav>
     18   <a href="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>
     19 
     20   <ul>
     21     <li><a href="../../index.html">Home</a>
     22     <li><a href="../../doc/manual.html">Manual</a>
     23     <li><a href="https://github.com/codemirror/codemirror">Code</a>
     24   </ul>
     25   <ul>
     26     <li><a href="../index.html">Language modes</a>
     27     <li><a class=active href="#">R</a>
     28   </ul>
     29 </div>
     30 
     31 <article>
     32 <h2>R mode</h2>
     33 <form><textarea id="code" name="code">
     34 X <- list(height = 5.4, weight = 54)
     35 cat("Printing objects: "); print(X)
     36 print("Accessing individual elements:")
     37 cat(sprintf("Your height is %s and your weight is %s\n", X$height, X$weight))
     38 
     39 # Functions:
     40 square <- function(x) {
     41   return(x * x)
     42 }
     43 cat(sprintf("The square of 3 is %s\n", square(3)))
     44 
     45 # In R, the last expression in a function is, by default, what is
     46 # returned. The idiomatic way to write the function is:
     47 square <- function(x) {
     48   x * x
     49 }
     50 # or, for functions with short content:
     51 square <- function(x) x * x
     52 
     53 # Function arguments with default values:
     54 cube <- function(x = 5) x * x * x
     55 cat(sprintf("Calling cube with 2 : %s\n", cube(2))  # will give 2^3
     56 cat(sprintf("Calling cube        : %s\n", cube())   # will default to 5^3.
     57 
     58 powers <- function(x) list(x2 = x*x, x3 = x*x*x, x4 = x*x*x*x)
     59 
     60 cat("Powers of 3: "); print(powers(3))
     61 
     62 # Data frames
     63 df <- data.frame(letters = letters[1:5], '#letter' = 1:5)
     64 print(df$letters)
     65 print(df$`#letter`)
     66 
     67 # Operators:
     68 m1 <- matrix(1:6, 2, 3)
     69 m2 <- m1 %*% t(m1)
     70 cat("Matrix product: "); print(m2)
     71 
     72 # Assignments:
     73 a <- 1
     74 b <<- 2
     75 c = 3
     76 4 -> d
     77 5 ->> e
     78 </textarea></form>
     79     <script>
     80       var editor = CodeMirror.fromTextArea(document.getElementById("code"), {});
     81     </script>
     82 
     83     <p><strong>MIME types defined:</strong> <code>text/x-rsrc</code>.</p>
     84 
     85     <p>Development of the CodeMirror R mode was kindly sponsored
     86     by <a href="https://twitter.com/ubalo">Ubalo</a>.</p>
     87 
     88   </article>