| transform {base} | R Documentation |
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.
transform(x, ...)
x |
The object to be transformed |
... |
Further arguments of the form tag=value |
The ... arguments to transform.data.frame are tagged
vector expressions, which are evaluated in the data frame
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.
The modified value of x.
If some of the values are not vectors of the appropriate length, you deserve whatever you get!
Peter Dalgaard
transform(airquality, Ozone = -Ozone) transform(airquality, new = -Ozone, Temp = (Temp-32)/1.8) attach(airquality) transform(Ozone, logOzone = log(Ozone)) # marginally interesting ... detach(airquality)