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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(`_data`, …)The object to be transformed
Further arguments of the form tag=value
The modified value of _data.
This is a convenience function intended for use interactively. For
programming it is better to use the standard subsetting arithmetic functions,
and in particular the non-standard evaluation of
argument transform can have unanticipated consequences.
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.
within for a more flexible approach,
subset,
list,
data.frame
# 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)
# }
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