03. Functions

[briatte]

• [ ] 3.0 Functions, e.g.
  • [ ] Math
  • [ ] Data
  • [ ] Models – introduce formula notation
  • [ ] quickly mention plots, HTTP calls, whatever
• [ ] 3.1 Control flow
  • [ ] The Human Narrative: # comments
  • [ ] The Computer Narrative: %>% pipe operator
  • [ ] Conditions: if/else, else_if, mutate_if, when
  • [ ] Sanity Checks: stopifnot – quickly mention unit tests for packages
• [ ] 3.2 Iteration (with mentions of parallelization)
  • [ ] Loops: for, while – mention parallelization with foreach
  • [ ] Vectorization: sapply, lapply, mapply, map_* – parallelization with mcapply
  • [ ] Need for Speed? mention benchmarking
  • [ ] Reproducible Code:
    • [ ] Reproducibility = 10% code, 90% human documentation
    • [ ] Writing pseudo-makefiles for a data analysis folder
    • [ ] Makefiles + cron (with demo scraper)
• [ ] Practice
• Currently: Computing the Herfindhal-Hirschman Index
• Add: Examples of calls using Stan, Julia, Python, shell?
• Add: Game of Life example to show iteration and matrix computations (Petr Keil)