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1 <!doctype html>
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2
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3 <title>CodeMirror: R mode</title>
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4 <meta charset="utf-8"/>
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5 <link rel=stylesheet href="../../doc/docs.css">
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6
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7 <link rel="stylesheet" href="../../lib/codemirror.css">
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8 <script src="../../lib/codemirror.js"></script>
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9 <script src="r.js"></script>
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10 <style>
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11 .CodeMirror { border-top: 1px solid silver; border-bottom: 1px solid silver; }
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12 .cm-s-default span.cm-semi { color: blue; font-weight: bold; }
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13 .cm-s-default span.cm-dollar { color: orange; font-weight: bold; }
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14 .cm-s-default span.cm-arrow { color: brown; }
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15 .cm-s-default span.cm-arg-is { color: brown; }
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16 </style>
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17 <div id=nav>
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18 <a href="https://codemirror.net/5"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png" alt=""></a>
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19
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20 <ul>
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21 <li><a href="../../index.html">Home</a>
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22 <li><a href="../../doc/manual.html">Manual</a>
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23 <li><a href="https://github.com/codemirror/codemirror5">Code</a>
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24 </ul>
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25 <ul>
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26 <li><a href="../index.html">Language modes</a>
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27 <li><a class=active href="#">R</a>
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28 </ul>
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29 </div>
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30
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31 <article>
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32 <h2>R mode</h2>
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33 <form><textarea id="code" name="code">
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34 X <- list(height = 5.4, weight = 54)
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35 cat("Printing objects: "); print(X)
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36 print("Accessing individual elements:")
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37 cat(sprintf("Your height is %s and your weight is %s\n", X$height, X$weight))
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38
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39 # Functions:
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40 square <- function(x) {
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41 return(x * x)
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42 }
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43 cat(sprintf("The square of 3 is %s\n", square(3)))
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44
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45 # In R, the last expression in a function is, by default, what is
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46 # returned. The idiomatic way to write the function is:
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47 square <- function(x) {
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48 x * x
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49 }
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50 # or, for functions with short content:
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51 square <- function(x) x * x
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52
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53 # Function arguments with default values:
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54 cube <- function(x = 5) x * x * x
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55 cat(sprintf("Calling cube with 2 : %s\n", cube(2)) # will give 2^3
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56 cat(sprintf("Calling cube : %s\n", cube()) # will default to 5^3.
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57
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58 powers <- function(x) list(x2 = x*x, x3 = x*x*x, x4 = x*x*x*x)
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59
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60 cat("Powers of 3: "); print(powers(3))
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61
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62 # Data frames
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63 df <- data.frame(letters = letters[1:5], '#letter' = 1:5)
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64 print(df$letters)
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65 print(df$`#letter`)
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66
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67 # Operators:
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68 m1 <- matrix(1:6, 2, 3)
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69 m2 <- m1 %*% t(m1)
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70 cat("Matrix product: "); print(m2)
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71
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72 # Assignments:
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73 a <- 1
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74 b <<- 2
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75 c = 3
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76 4 -> d
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77 5 ->> e
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78 </textarea></form>
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79 <script>
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80 var editor = CodeMirror.fromTextArea(document.getElementById("code"), {});
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81 </script>
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82
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83 <p><strong>MIME types defined:</strong> <code>text/x-rsrc</code>.</p>
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84
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85 <p>Development of the CodeMirror R mode was kindly sponsored
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86 by <a href="https://twitter.com/ubalo">Ubalo</a>.</p>
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87
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88 </article>
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