Data frames and matrices

Menulis Kode R yang Efisien

Colin Gillespie

Jumping Rivers & Newcastle University

The data frame

• Key data structure in R
  • Copied in other languages
    • Python: pandas data frame
    • If you can't beat them, join them!

Data frames

• Tabular structure: rows and colums
  • read.csv()and friends returns a data frame
    • Columns
  • Data must be the same type
    • Rows
  • Different type

Storage

Selection

Matrices

• It's a rectangular data structure
  • You can perform usual subsetting and extracting operations
  • BUT - every element must be the same data type

Storage

Selection

R club

The third rule of R club: Use a matrix whenever appropriate.

Let's practice!

Menulis Kode R yang Efisien