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R page

Vectors

Vectors are one-dimensional arrays that can hold numeric data, character data, or logical data.

Matrices

A matrix is a two-dimentional array where each element has the same mode(numeric, character, or logical).

Arrays

Arrays are similar to matrices but can have more than two dimentions.

Data frames

A data frames is more general than a matrix in that different columns can contain different modes of data (numeric, character, etc).

Factors

As you've seen, variables can be described as nominal, ordinal, or continuous.

Lists

Lists are the most complex of the R data types. Basically, a list is an ordered collection of objects (components).