Long and Short of R in an Hour

• R is a language and environment for statistical computing and graphics. It includes

  • an effective data handling and storage facility,
  • a suite of operators for calculations on arrays, in particular matrices,
  • a large collection of intermediate tools for data analysis,
  • graphical facilities for data analysis and display either on-screen or on hardcopy,
  • a well-developed programming language which includes conditionals, loops, user-defined recursive functions and input and output facilities.

• RStudio is an integrated development environment (IDE) for R.
• It includes a console, syntax-highlighting editor that supports direct code execution, as well as tools for plotting, history, debugging and workspace management.

• R includes a powerful and flexible system (Sweave) for creating dynamic reports and reproducible research using LaTeX.

• Sweave enables the embedding of R code within LaTeX documents to generate a PDF file that includes narrative and analysis, graphics, code, and the results of computations.

For more details on authoring R presentations please visit https://support.rstudio.com/hc/en-us/articles/200486468.

• knitr is an R package that adds many new capabilities to Sweave and is also fully supported by RStudio.

-You can use knitr rather than classic Sweave for weaving Rnw files.

• To use Sweave and knitr to create PDF reports, you will need to have LaTeX installed on your system. LaTeX can be installed following the directions on the LaTeX project page.

• Rnw stands for R NoWeb files. They have to be processed by Sweave i.e. code chunks are processed with R and results inluded into a LaTeX file that itself has to be processed by LaTeX oder PDFLaTeX.

• Workflow R Markdown is a format for writing reproducible, dynamic reports with R. Use it to embed R code and results into slideshows, pdfs, html documents.

• They use different syntax to wrap up R code in the input document, and the results returned from R are marked up according to the syntax of the output document.

• You'll use substantially the same structure to write a document using markdown or \( \LaTeX \), that is, with a .Rmd or .Rnw file type.t

  • \( \LaTeX \) compiles nicely to PDF, Rmd to HTML.
  • Rmd is easier to write and compile, but offers less control over formatting.
  • If you already know \( \LaTeX \), Rnw isn't really any harder.

• Cheatsheet link. https://www.rstudio.com/wp-content/uploads/2015/02/rmarkdown-cheatsheet.pdf

summary(cars)

     speed           dist       
 Min.   : 4.0   Min.   :  2.00  
 1st Qu.:12.0   1st Qu.: 26.00  
 Median :15.0   Median : 36.00  
 Mean   :15.4   Mean   : 42.98  
 3rd Qu.:19.0   3rd Qu.: 56.00  
 Max.   :25.0   Max.   :120.00