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yihui / dco.txt
Last active September 22, 2020 21:00
Developer's Certificate of Origin 1.1
Developer Certificate of Origin
Version 1.1
Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
1 Letterman Drive
Suite D4700
San Francisco, CA, 94129
Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.
yihui / scrape-rviews.R
Created July 3, 2017 19:07
The R script I used to scrape the old RViews site (WordPress)
page_post_links = function(
page = 1, baseurl = '',
xpath = '//h2[@class="entry-title"]/a'
) {
html = read_html(sprintf('%s/page/%d/', baseurl, page))
xml_attr(xml_find_all(html, xpath), 'href')
yihui /
Created April 15, 2016 19:25
Install TeXLive on Linux
# you can replace $HOME with any dir
sed -i 's@\$TEXLIVEHOME@'"$HOME"'@' texlive.profile
tar zxf install-tl-unx.tar.gz
./install-tl*/install-tl -profile texlive.profile
# texlive.tar.gz is a portable and full TeXLive package
tar zcf texlive.tar.gz -C $HOME texlive

title: "Show Your Webcam in R Markdown Presentations" author: "Yihui Xie" date: "2015/10/25" output: slidy_presentation: incremental: yes duration: 40 footer: "Webcam in R Markdown, Yihui Xie, 2015" includes:

yihui / htmltools-deps.Rmd
Created March 31, 2015 02:33
A minimal example of HTML dependencies
title: HTML Dependencies
output: html_document
This example explains how HTML dependencies work in **htmltools**. Sometimes an HTML fragment may have additional dependencies to work correctly, such as JavaScript and/or CSS files. In R Markdown documents, you have to let **rmarkdown** know these dependencies, so they can be added to the HTML header when the document is rendered through Pandoc.
Another thing that you need to pay attention is you have to "protect" your HTML output so that Pandoc does not touch it, e.g. when you have four leading spaces, Pandoc may think this line is supposed to be a `<pre>` block whereas you only meant to indent the line for cosmetic purposes. In this case, the function `htmltools::htmlPreserve()` will be _automatically_ applied to your HTML content in R Markdown if the content is generated from `htmltools::tags` or wrapped in `htmltools::HTML()`.
Now we use a random CSS file in the **knitr** package to illustrate how dependencies work. The goal here is to generate a
yihui /
Last active March 15, 2017 18:35
A Shiny app based on annyang that responds to voice input
yihui / test.Rnw
Created December 23, 2013 22:15
The Rnw document that confused several people in R-help.
<<setup, include=FALSE, cache=FALSE>>=
\title{Knitr and ggplot2}
\author{Daniel Haugstvedt}
yihui / readme.Rmd
Last active August 31, 2023 22:00
A list of package vignettes built from knitr on CRAN
Here is a list of package vignettes _possibly_ built with **knitr** on CRAN.
```{r fetch-pkgs, include=FALSE}
pkgs = available.packages(contrib.url('', 'source'))
deps = tools::package_dependencies('knitr', pkgs, which = 'all', reverse = TRUE)[['knitr']]
deps = setdiff(deps, 'R.rsp') # packages that do not use knitr
deps = sort(c(deps, 'knitr'))
```{r vig-list, include=FALSE, echo=FALSE, cache=TRUE, cache.extra=deps, message=FALSE, error=FALSE}
vigs = lapply(deps, function(pkg) {
yihui / warnings.R
Created September 22, 2013 04:05
this shows the correct way to suppress warnings is suppressWarnings() instead of options(warn = -1) alone; similarly, you should use suppressMessages() to suppress messages
options(warn = -1)
# cannot really suppress warnings from the root level
withCallingHandlers(warning("hi"), warning = function(w) {
# the warning can still be captured:
## <simpleWarning in withCallingHandlers(warning("hi"), warning = function(w) { print(w)}): hi>
# however, this always works
yihui / par_page.R
Created August 27, 2013 20:48
test par('page') which will be available in R 3.0.2
stopifnot(getRversion() > '3.0.1')