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<title>CodeMirror: R mode</title>
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  <a href="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>

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    <li><a href="../index.html">Language modes</a>
    <li><a class=active href="#">R</a>
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</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>