mStats (version 3.4.0)

generate: Create a new variable

Description

generate() creates a new variable either by deriving from existing variables or with a constant value.

Usage

generate(data, var, expr = NULL)

Arguments

data

data.frame

var

name for the new variable

expr

a constant value, name of an existing variable or an expression for simple arithmetic or logical operations:

Value

data.frame with the new variable

Details

The values of the variable are specified by expr.

Label

The newly created variable is automatically labeled with the expression specified.

Examples

# NOT RUN {
## generate variable with a constant value
generate(mtcars, new_var, NA)
generate(mtcars, new_var, 99)

## generate variable from an existing variable
generate(mtcars, new_var, mpg)

## generate variable with arithmetic operations
generate(iris, Length, Sepal.Length + Petal.Length)

# }