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  <!doctype html>
  <html>
    <head>
      <title>CodeMirror: R mode</title>
      <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>
      <link rel="stylesheet" href="../../doc/docs.css">
    </head>
    <body>
      <h1>CodeMirror: R mode</h1>
      <form><textarea id="code" name="code">
  # Code from http://www.mayin.org/ajayshah/KB/R/
  
  # FIRST LEARN ABOUT LISTS --
  X = list(height=5.4, weight=54)
  print("Use default printing --")
  print(X)
  print("Accessing individual elements --")
  cat("Your height is ", Xheight, " and your weight is ", Xweight, "\n")
  
  # FUNCTIONS --
  square <- function(x) {
    return(x*x)
  }
  cat("The square of 3 is ", square(3), "\n")
  
                   # default value of the arg is set to 5.
  cube <- function(x=5) {
    return(x*x*x);
  }
  cat("Calling cube with 2 : ", cube(2), "\n")    # will give 2^3
  cat("Calling cube        : ", cube(), "\n")     # will default to 5^3.
  
  # LEARN ABOUT FUNCTIONS THAT RETURN MULTIPLE OBJECTS --
  powers <- function(x) {
    parcel = list(x2=x*x, x3=x*x*x, x4=x*x*x*x);
    return(parcel);
  }
  
  X = powers(3);
  print("Showing powers of 3 --"); print(X);
  
  # WRITING THIS COMPACTLY (4 lines instead of 7)
  
  powerful <- function(x) {
    return(list(x2=x*x, x3=x*x*x, x4=x*x*x*x));
  }
  print("Showing powers of 3 --"); print(powerful(3));
  
  # In R, the last expression in a function is, by default, what is
  # returned. So you could equally just say:
  powerful <- function(x) {list(x2=x*x, x3=x*x*x, x4=x*x*x*x)}
  </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="http://ubalo.com/">Ubalo</a>, who hold
      the <a href="LICENSE">license</a>.</p>
  
    </body>
  </html>
  


(C) Æliens 04/09/2009

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