extractVariable: Extract variables according to mode from data.frame.
In epifit: Flexible Modelling Functions for Epidemiological Data Analysis

Description Usage Arguments Value Examples

This function extract variables which match specified mode from data.frame, and make a new data frame.

1	extractVariable(data = NULL, mode = "numeric")

`data`	a data.frame from which numeric variables are extracted.
`mode`	a character specifying object type. Object modes of ‘numeric’, ‘character’, ‘factor’, and ‘logical’ are supported.

a data.frame which includes only specified mode of variables.

df <- data.frame(id=seq(1,10), str=letters[1:10], fac=factor(seq(1,10)), stringsAsFactors=FALSE)
extractVariable(df)
extractVariable(df, mode="character")
extractVariable(df, mode="factor")