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R supports all types
of data. The simplest type of data is vector, which is one dimensional
representation of a string of similar entities. An example of vector is
this: a = ("Kolkata","Rome","New York", "London", "Melbourne"). This
represents a series of strings (names of cities). Or this, b = (2,3,4,5) –
representing a series of numbers. Moving up, a list is also one dimensional,
but it consists of a mixture of different types of data. For example, c =
(2,"London","YES") is an example of a list, one that contains a number, a
string, and a logical YES in it. Extending this concept further, a matrix is
two dimensional (or at least n dimensional) that contains only _one_ type of
data in it. A data frame is a two dimensional (or n dimensional)
entity that contains mix of different data types in it. In terms of
statistical data analysis, a data frame is the most commonly encountered
rectangular dataset that most people work with. |