transform(x, ...)
x
| The object to be transformed |
...
|
Further arguments of the form tag=value
|
transform is a generic function, which -- at least currently
-- only does anything useful with dataframes. transform.default
converts its first argument to a dataframe if possible and calls
transform.data.frame.
The ... arguments to transform.data.frame are tagged
vector expressions, which are evaluated in the dataframe x. The
tags are matched against names(x), and for those that match,
the value replace the corresponding variable in x, and the
others are appended to x
xsubset, list,
data.framedata(airquality) transform(airquality,Ozone=-Ozone) transform(airquality,new=-Ozone,Temp=(Temp-32)/1.8) attach(airquality) transform(Ozone,logOzone=log(Ozone)) # marginally interesting... detach(airquality)