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<!--
%\VignetteEngine{knitr::knitr}
%\VignetteIndexEntry{An R HTML Vignette with knitr}
-->
<head>
<meta charset="utf-8">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
body,td{width:800px;margin:auto;}
</style>
  <title>An R HTML vignette with knitr</title>
</head>
<!--begin.rcode setup, include=FALSE
library(knitr)
# to base64 encode images
opts_knit$set(upload.fun = image_uri)
end.rcode-->

<body>

<p>This is an R HTML vignette. The file extension is <code>*.Rhtml</code>, and
it has to include a special comment to tell R that this file needs to be
compiled by <strong>knitr</strong>:</p>

<pre>&lt;!--
%\VignetteEngine{knitr::knitr}
%\VignetteIndexEntry{The Title of Your Vignette}
--&gt;
</pre>

<p>Now you can write R code chunks:</p>

<!--begin.rcode cars-demo
summary(cars)
fit=lm(dist~speed, data=cars)
summary(fit)
end.rcode-->

<p>You can also embed plots, for example:</p>

<!--begin.rcode cars-plot, fig.width=7, fig.height=6, fig.align='center'
par(mar=c(4,4,.1,.1))
plot(cars, pch=19)
end.rcode-->

<p>For package vignettes, you need to encode images in base64 strings using the
<code>knitr::image_uri()</code> function so that the image files are no longer
needed after the vignette is compiled. For example, you can add this chunk in
the beginning of a vignette:</p>

<!--begin.rcode setup, eval=FALSE
end.rcode-->

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