transform

R Base 3.6.2

transform is a generic function, which---at least currently---only does anything useful with data frames. transform.default converts its first argument to a data frame if possible and calls transform.data.frame.

Syntax

transform(`_data`, &#8230;)

Arguments

Parameter	Description
`_data`	The object to be transformed
`…`	Further arguments of the form tag=value

Return Value

The modified value of _data.

Details

The … arguments to transform.data.frame are tagged vector expressions, which are evaluated in the data frame _data. The tags are matched against names(_data), and for those that match, the value replace the corresponding variable in _data, and the others are appended to _data.

Examples

Example

# NOT RUN {
transform(airquality, Ozone = -Ozone)
transform(airquality, new = -Ozone, Temp = (Temp-32)/1.8)

attach(airquality)
transform(Ozone, logOzone = log(Ozone)) # marginally interesting ...
detach(airquality)
# }