ffbase (version 0.13.3)

transform.ffdf: Transform a ffdf data.frame

Description

Same functionality as transform, but on a ffdf object. Please note that you should write your expression as if it is a normal data.frame. The resulting data.frame however will be a ffdf data.frame.

Usage

# S3 method for ffdf
transform(`_data`, …)

Arguments

_data

ffdf data object to be transformed.

...

named arguments that will be added to the ffdf data.frame

Value

a modified clone of `_data`.

Examples

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