transform.ffdf: Transform a ffdf data.frame

Description Usage Arguments Value Examples

View source: R/transform.R

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

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## S3 method for class '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

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transform(as.ffdf(airquality), Ozone = -Ozone)
transform(as.ffdf(airquality), new = -Ozone, Temp = (Temp-32)/1.8)

ffbase documentation built on Feb. 27, 2021, 5:06 p.m.