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SM4A lectuRe and woRkshop
Gabriele Mongiano
2021-11-12
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This presentation and all the code

https://github.com/kofm/sm4a_lectuRe

https://github.com/kofm/sm4a_lectuRe

I cannot teach you R! What then?

  • A basic understanding of what R is
  • An overview of R capabilities and its syntax
  • Practical usage of R to analyze crop model output

What is R?

  • Programming language and environment for statistical computing
  • Provides wide variety of statistical and graphical techniques

Why should I use it?

  • GNU project, free and open-source
    • Large community of professionals and enthusiasts, huge support (R-Bloggers, Stack Overflow, free books)
    • Multiplatform, runs on any major operating system
  • Supports procedural programming with functions function()
  • Interpreted language; accessed through a command-line interpreter.
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What can R do?

  • Integrated environment for data manipulation, calculation and graphical display
    • Data handling and storage, database operations (big data anyone?)
    • Easy operations on array, matrices and data tables
    • Graphical tools for any data-centric purpose
    • Simple and effective programming language, highly extensible, can be coupled with compiled languages (like C or C++) for computationally intensive tasks.

HUGE repository of packages

  • Packages are bits (or very large, too!) of reusable code to perform any sort of task
  • Within the CRAN there are over 18000 packages for:
    • Literally any type of statistical analysis (linear and nonlinear modelling, statistical test, time-series analysis, clustering, machine learning, nerural networks, ...) -› Vignettes and CRAN Tasks!
    • **Graphical representations **(publication-quality plots or digital version).
    • Fully reproducible high quality documents, reports or presentations (you can embed code to generate plots and tables too), supporting dozen of output formats like PDF, MS Word, or even HTML.
    • Capabilities for producing Web Apps and Dashboards
    • MORE!

Why not use R?

  • A bit of a learning curve (simple language, though!)
  • Painfully slow compared to other languages (supports distributed computing, though!)

Let's look at some code!

https://learnxinyminutes.com/docs/r

https://learnxinyminutes.com/docs/r