2016-07-23 05:29:20 +00:00
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<!doctype html>
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<title>CodeMirror: R mode</title>
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<meta charset="utf-8"/>
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<link rel=stylesheet href="../../doc/docs.css">
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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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<div id=nav>
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2019-10-15 08:40:42 +00:00
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<a href="https://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>
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2016-07-23 05:29:20 +00:00
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<ul>
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<li><a href="../../index.html">Home</a>
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<li><a href="../../doc/manual.html">Manual</a>
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<li><a href="https://github.com/codemirror/codemirror">Code</a>
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</ul>
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<ul>
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<li><a href="../index.html">Language modes</a>
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<li><a class=active href="#">R</a>
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</ul>
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</div>
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<article>
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<h2>R mode</h2>
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<form><textarea id="code" name="code">
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2019-10-15 08:40:42 +00:00
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X <- list(height = 5.4, weight = 54)
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cat("Printing objects: "); print(X)
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print("Accessing individual elements:")
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cat(sprintf("Your height is %s and your weight is %s\n", X$height, X$weight))
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2016-07-23 05:29:20 +00:00
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2019-10-15 08:40:42 +00:00
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# Functions:
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2016-07-23 05:29:20 +00:00
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square <- function(x) {
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2019-10-15 08:40:42 +00:00
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return(x * x)
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2016-07-23 05:29:20 +00:00
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}
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2019-10-15 08:40:42 +00:00
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cat(sprintf("The square of 3 is %s\n", square(3)))
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2016-07-23 05:29:20 +00:00
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2019-10-15 08:40:42 +00:00
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# In R, the last expression in a function is, by default, what is
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# returned. The idiomatic way to write the function is:
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square <- function(x) {
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x * x
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2016-07-23 05:29:20 +00:00
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}
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2019-10-15 08:40:42 +00:00
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# or, for functions with short content:
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square <- function(x) x * x
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2016-07-23 05:29:20 +00:00
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2019-10-15 08:40:42 +00:00
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# Function arguments with default values:
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cube <- function(x = 5) x * x * x
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cat(sprintf("Calling cube with 2 : %s\n", cube(2)) # will give 2^3
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cat(sprintf("Calling cube : %s\n", cube()) # will default to 5^3.
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2016-07-23 05:29:20 +00:00
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2019-10-15 08:40:42 +00:00
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powers <- function(x) list(x2 = x*x, x3 = x*x*x, x4 = x*x*x*x)
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2016-07-23 05:29:20 +00:00
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2019-10-15 08:40:42 +00:00
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cat("Powers of 3: "); print(powers(3))
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2016-07-23 05:29:20 +00:00
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2019-10-15 08:40:42 +00:00
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# Data frames
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df <- data.frame(letters = letters[1:5], '#letter' = 1:5)
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print(df$letters)
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print(df$`#letter`)
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2016-07-23 05:29:20 +00:00
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2019-10-15 08:40:42 +00:00
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# Operators:
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m1 <- matrix(1:6, 2, 3)
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m2 <- m1 %*% t(m1)
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cat("Matrix product: "); print(m2)
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# Assignments:
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a <- 1
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b <<- 2
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c = 3
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4 -> d
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5 ->> e
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2016-07-23 05:29:20 +00:00
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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="https://twitter.com/ubalo">Ubalo</a>.</p>
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</article>
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