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% Writing beautiful and reproducible slides quickly % Yihui Xie % 2012/04/30

Why

  • after you finished typing \documentclass{beamer} and \title{}, I have finished my first slide with markdown
  • far fewer commands to remember, e.g. to write bullet points, just begin with a dash "-" instead of \begin{itemize} and \item; how things can be simpler?
  • I know you want math to show you are a statistician, e.g. $f(k)={n \choose k}p^{k}(1-p)^{n-k}$
  • you do not need to maintain output -- only maintain a source file
  • HTML5/CSS3 is much more fun than LaTeX

A bit R code

head(cars)
##   speed dist
## 1     4    2
## 2     4   10
## 3     7    4
## 4     7   22
## 5     8   16
## 6     9   10

cor(cars)
##        speed   dist
## speed 1.0000 0.8069
## dist  0.8069 1.0000

Graphics too

library(ggplot2)
qplot(speed, dist, data = cars) + geom_smooth()

A scatterplot of cars

How

  • source editor: RStudio (perfect integration with knitr; one-click compilation); currently you have to use the version >= 0.96.109
  • HTML5 slides converter: pandoc; this document was generated by: pandoc -s -S -i -t dzslides --mathjax knitr-slides.md -o knitr-slides.html
  • the file knitr-slides.md is the markdown output from its source: library(knitr); knit('knitr-slides.Rmd')
  • or simple click the button Knit HTML in RStudio

For ninjas

  • you should tweak the default style; why not try some Google web fonts? (think how painful it is to wrestle with fonts in LaTeX)
  • pandoc provides 3 types of HTML5 slides (dzslides is one of them)
  • you can tweak the default template to get better appearances
  • if you have come up with a better dzslides template, please let me know or contribute to pandoc directly (e.g. pre blocks should have max-width and max-height)

For beamer lovers

  • pandoc supports conversion to beamer as well. period.

For Powerpoint lovers

  • ...

Reproducible research

It is good to include the session info, e.g. this document is produced with knitr. Here is my session info:

print(sessionInfo(), locale = FALSE)
## R version 3.2.3 (2015-12-10)
## Platform: x86_64-pc-linux-gnu (64-bit)
## Running under: Ubuntu 15.04
## 
## attached base packages:
## [1] stats     graphics  grDevices utils     datasets  base     
## 
## other attached packages:
## [1] ggplot2_2.0.0 knitr_1.11.24
## 
## loaded via a namespace (and not attached):
##  [1] Rcpp_0.12.2      codetools_0.2-14 digest_0.6.8     grid_3.2.3      
##  [5] plyr_1.8.3       gtable_0.1.2     formatR_1.2.2    magrittr_1.5    
##  [9] evaluate_0.8     scales_0.3.0     stringi_1.0-1    labeling_0.3    
## [13] tools_3.2.3      stringr_1.0.0    munsell_0.4.2    colorspace_1.2-6
## [17] methods_3.2.3

Misc issues

  • the plots are too wide? use the chunk option out.width which will be used in <img width=... />, e.g. out.width=400px

Life is short

  • so keep your audience awake!