2018

- R is a language, a software and a philosophy
- R is open, free, transparent and flexible
- R is one of the most active languages/programmes

- Free software for statistics and visualisation
- Open-source GNU project, based on S (John Chambers)
- primarily accessible via command line
- High-level, interpreted, functional, object-oriented

Everything that is called in R is a function.

Everything that is created in R is an object.

- R can be used for
- Calculations and data visualisation
- Image and sound manipulation
- Internet and email scraping
- Generation of reports
- Writing of books
- Generation of presentations

- we do not explicitly see the data,
- we explicitly write down what is done,
- we have to think about data structure,
- we combine functions almost all the time,
- we usually generate graphical (not tabular) output,
we can easily work without touching the mouse.

R is object oriented and vector based.

- Time: 5 minutes
- Which five keywords describe R best?
- What are pros and cons of "free and open software"?
- Start RStudio, use R as a calculator
- Calculate the volume of a sphere with 5 cm radius
- Calculate the square root of the square of the cosine of a number

- RStudio is a graphical user and developer interface for R
- A second skin to work more efficiently with R