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<!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="http://codemirror.net">
<h1>CodeMirror</h1>
<img id=logo src="../../doc/logo.png">
</a>
<ul>
<li>
<a href="../../index.html">Home</a>
<li>
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<ul>
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<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"> # 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 ", X$height, " and your weight
is ", X$weight, "\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=l ist(x2=x*x, x3=x*x*x, x4=x*x*x*x); return(parcel); } X=p owers(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="https://twitter.com/ubalo">Ubalo</a>.</p>
</article>