Arrays and matrices

• Arrays
• Array indexing. Subsections of an array
• Index arrays
• The array() function
  • Mixed vector and array arithmetic. The recycling rule
• The outer product of two arrays
  • An example: Determinants of 2x2 digit matrices
• Generalized transpose of an array
• Matrix facilities. Multiplication, inversion and solving linear equations.
• Forming partitioned matrices. cbind() and rbind().
• The concatenation function, c(), with arrays.
• Frequency tables from factors. The table() function