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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><a href="../../doc/manual.html">Manual</a>
<li><a href="https://github.com/codemirror/codemirror">Code</a>
</ul>
<ul>
<li><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 = 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="https://twitter.com/ubalo">Ubalo</a>.</p>
</article>