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images.html
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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="generator" content="pandoc" />
<title>Include Images</title>
<script src="site_libs/jquery-1.11.3/jquery.min.js"></script>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link href="site_libs/bootstrap-3.3.5/css/cosmo.min.css" rel="stylesheet" />
<script src="site_libs/bootstrap-3.3.5/js/bootstrap.min.js"></script>
<script src="site_libs/bootstrap-3.3.5/shim/html5shiv.min.js"></script>
<script src="site_libs/bootstrap-3.3.5/shim/respond.min.js"></script>
<script src="site_libs/navigation-1.1/tabsets.js"></script>
<link href="site_libs/highlightjs-1.1/default.css" rel="stylesheet" />
<script src="site_libs/highlightjs-1.1/highlight.js"></script>
<style type="text/css">code{white-space: pre;}</style>
<style type="text/css">
pre:not([class]) {
background-color: white;
}
</style>
<script type="text/javascript">
if (window.hljs && document.readyState && document.readyState === "complete") {
window.setTimeout(function() {
hljs.initHighlighting();
}, 0);
}
</script>
<style type="text/css">
h1 {
font-size: 34px;
}
h1.title {
font-size: 38px;
}
h2 {
font-size: 30px;
}
h3 {
font-size: 24px;
}
h4 {
font-size: 18px;
}
h5 {
font-size: 16px;
}
h6 {
font-size: 12px;
}
.table th:not([align]) {
text-align: left;
}
</style>
</head>
<body>
<style type = "text/css">
.main-container {
max-width: 940px;
margin-left: auto;
margin-right: auto;
}
code {
color: inherit;
background-color: rgba(0, 0, 0, 0.04);
}
img {
max-width:100%;
height: auto;
}
.tabbed-pane {
padding-top: 12px;
}
button.code-folding-btn:focus {
outline: none;
}
</style>
<style type="text/css">
/* padding for bootstrap navbar */
body {
padding-top: 51px;
padding-bottom: 40px;
}
/* offset scroll position for anchor links (for fixed navbar) */
.section h1 {
padding-top: 56px;
margin-top: -56px;
}
.section h2 {
padding-top: 56px;
margin-top: -56px;
}
.section h3 {
padding-top: 56px;
margin-top: -56px;
}
.section h4 {
padding-top: 56px;
margin-top: -56px;
}
.section h5 {
padding-top: 56px;
margin-top: -56px;
}
.section h6 {
padding-top: 56px;
margin-top: -56px;
}
</style>
<script>
// manage active state of menu based on current page
$(document).ready(function () {
// active menu anchor
href = window.location.pathname
href = href.substr(href.lastIndexOf('/') + 1)
if (href === "")
href = "index.html";
var menuAnchor = $('a[href="' + href + '"]');
// mark it active
menuAnchor.parent().addClass('active');
// if it's got a parent navbar menu mark it active as well
menuAnchor.closest('li.dropdown').addClass('active');
});
</script>
<div class="container-fluid main-container">
<!-- tabsets -->
<script>
$(document).ready(function () {
window.buildTabsets("TOC");
});
</script>
<!-- code folding -->
<div class="navbar navbar-default navbar-fixed-top" role="navigation">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar">
<span class="icon-bar"></span>
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</button>
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<ul class="nav navbar-nav">
<li>
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<a href="writepage.html">Writing Pages</a>
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<ul class="nav navbar-nav navbar-right">
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</div><!--/.nav-collapse -->
</div><!--/.container -->
</div><!--/.navbar -->
<div class="fluid-row" id="header">
<h1 class="title toc-ignore">Include Images</h1>
</div>
<p>Including an image using <code>rmarkdown</code> is easy.</p>
<p>In the files pane in RStudio choose <code>New Folder</code> (or create one in your Finder in the Rproject folder). Call it say <code>images</code>.</p>
<p>To reference an image in rmarkdown use the following.</p>
<p><code></code></p>
<p>Here is an example of a network visual created in <a href="https://gephi.org">Gephi</a> and saved in <code>images</code>.</p>
<div class="figure">
<img src="images/fig31_adjust_nodes.png" />
</div>
<div id="sizing-images" class="section level2">
<h2>Sizing images</h2>
<p>There are a number of ways of sizing images using the <code>knitr</code> package. One of the simplest is to size images in R code chunks.</p>
<p>To inserta code chunk use <code>Ctrl Alt I</code> on Windows or <code>Cmd I</code> on a Mac.</p>
<p>In the code chunk heading we could specify the width of a figure as percentages and we might also want to centre the figure <code>{r out.width = "50%", fig.align = "center"}</code>. We would then include a call to <code>knitr::include_graphics()</code> with our image address in quotes as below. Note that the knitr documentation specifies that you may need to <code>install.packages("png")</code> and <code>install.packages("jpeg")</code> for automatic calculation of the width of images.</p>
<p>For most purposes something like this will work for a web page display. To exclude the code chunk that you see below change <code>echo = TRUE</code> to <code>echo = FALSE</code>. That will display the image but not the code chunk.</p>
<pre class="r"><code>knitr::include_graphics("images/fig31_adjust_nodes.png")</code></pre>
<p><img src="images/fig31_adjust_nodes.png" width="50%" style="display: block; margin: auto;" /></p>
</div>
</div>
<script>
// add bootstrap table styles to pandoc tables
function bootstrapStylePandocTables() {
$('tr.header').parent('thead').parent('table').addClass('table table-condensed');
}
$(document).ready(function () {
bootstrapStylePandocTables();
});
</script>
<!-- dynamically load mathjax for compatibility with self-contained -->
<script>
(function () {
var script = document.createElement("script");
script.type = "text/javascript";
script.src = "https://mathjax.rstudio.com/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML";
document.getElementsByTagName("head")[0].appendChild(script);
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