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<!doctype html>
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<html>
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  <head>
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    <title>CodeMirror: R mode</title>
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    <link rel="stylesheet" href="../../lib/codemirror.css">
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    <script src="../../lib/codemirror.js"></script>
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    <script src="r.js"></script>
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    <style>
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      .CodeMirror { border-top: 1px solid silver; border-bottom: 1px solid silver; }
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      .cm-s-default span.cm-semi { color: blue; font-weight: bold; }
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      .cm-s-default span.cm-dollar { color: orange; font-weight: bold; }
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      .cm-s-default span.cm-arrow { color: brown; }
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      .cm-s-default span.cm-arg-is { color: brown; }
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    </style>
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    <link rel="stylesheet" href="../../doc/docs.css">
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  </head>
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  <body>
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    <h1>CodeMirror: R mode</h1>
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    <form><textarea id="code" name="code">
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# Code from http://www.mayin.org/ajayshah/KB/R/
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# FIRST LEARN ABOUT LISTS --
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X = list(height=5.4, weight=54)
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print("Use default printing --")
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print(X)
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print("Accessing individual elements --")
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cat("Your height is ", X$height, " and your weight is ", X$weight, "\n")
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# FUNCTIONS --
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square <- function(x) {
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  return(x*x)
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}
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cat("The square of 3 is ", square(3), "\n")
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                 # default value of the arg is set to 5.
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cube <- function(x=5) {
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  return(x*x*x);
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}
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cat("Calling cube with 2 : ", cube(2), "\n")    # will give 2^3
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cat("Calling cube        : ", cube(), "\n")     # will default to 5^3.
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# LEARN ABOUT FUNCTIONS THAT RETURN MULTIPLE OBJECTS --
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powers <- function(x) {
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  parcel = list(x2=x*x, x3=x*x*x, x4=x*x*x*x);
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  return(parcel);
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}
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X = powers(3);
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print("Showing powers of 3 --"); print(X);
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# WRITING THIS COMPACTLY (4 lines instead of 7)
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powerful <- function(x) {
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  return(list(x2=x*x, x3=x*x*x, x4=x*x*x*x));
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}
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print("Showing powers of 3 --"); print(powerful(3));
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# In R, the last expression in a function is, by default, what is
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# returned. So you could equally just say:
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powerful <- function(x) {list(x2=x*x, x3=x*x*x, x4=x*x*x*x)}
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</textarea></form>
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    <script>
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      var editor = CodeMirror.fromTextArea(document.getElementById("code"), {});
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    </script>
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    <p><strong>MIME types defined:</strong> <code>text/x-rsrc</code>.</p>
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    <p>Development of the CodeMirror R mode was kindly sponsored
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    by <a href="http://ubalo.com/">Ubalo</a>, who hold
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    the <a href="LICENSE">license</a>.</p>
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  </body>
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</html>