Variables in R

Variables are used to store data, whose value can be changed according to our. To define the inputs or entity we have to give name our variables. To do so we have to follow certain rules for defining variables as in below:-

Naming Convension

• alllowercase: e.g. dataframes
• period.separated: e.g. firstname.lastname
• underscore_separated: e.g. data_frames
• lowerCamelCase: e.g. dFrame
• UpperCamelCase: e.g. CalculateAge

Constants in R

• Numeric Constants: It can be checked with the typeof() function. e.g. typeof(5)
• Character Constants  : single quotes (') or double quotes (")   e.g. typeof("abc")
• Built-in Constants: LETTERS,letters,pi,month.name etc e.g. letters[1:5]

[1] "a" "b" "c" "d" "e" UpperCamelCase: e.g. CalculateAge